If I understand you correctly, the argument is then simply incorrect due to working on the assumptions that:
1. Real work time should be a fraction of what it is to be due to greed. This is not always the case and in some ways impossible due to cases like long commute.
It isn't "greed", nobody makes such a moralistic argument (or should make, the sad reality is so many 'communists' are so ill-informed they do make this argument), it's that it has to be like this in our world. Like I said, the unretributed part of your labour
has to be unretributed for the firm's survival, it doesn't depend on the firm or the boss. The unretributed time you spend for it is profit that's invested in expansion of business, acquisition of new machinery, money meant for upkeep, and so on, everything needed for the firm's survival. And in a situation in which wage labour survives, then no matter how much you cut working hours, part of them will still be unretributed, which would just create a vicious circle until nobody will work anymore, and nobody, well, would get shit done anymore.
So, you don't simply cut working hours, though communism would realistically have shorter working hours and integrated in your own life rather than separate from it (which by the way makes moot the whole concept of 'commuting to work', your work is at home, or around it), you eliminate wage labour, which would only tangentially result in shorter working hours. Because by eliminating wage labour, you eliminate the conditions that make part of your labour time unretributed, and thus unnecessary to you.
2. People who would like to work for society or personal sake. Dangerous hard work like construction will never have people lining up to join and people will always prefer cushy office jobs over field work.
You work for yourself, 'society' is something unquantifiable, just a collection of individuals. "Society" is just another word for, essentially, yourself. Your bed, your food, your fence, and why not, your home.
Office jobs would largely disappear, they're useless, and besides they're a manifestation of a division of labour in intellectual and physical one, which would disappear.
You would "fish in the morning, hunt in the afternoon, rear cattle in the evening and criticise at night, just as I have a mind, without ever becoming hunter, fisherman, shepherd or critic" (-cit.) as Saint Karl said, you would be anything you need to be on the spot or in advance for the need to come, and being working hours shorter, you wouldn't lack the time needed to learn how to do it either.
But, because everyone works for himself and everyone is part of something real but unquantifiable known as 'society', something made of individuals, then individual work for your own sake and for those immediately around you has an inherently social character.
The misunderstanding appears to be semantic in nature, but that's fine and that's our fault, communists have a terrible habit of calling things counter-intuitively.
The whole thing rests on some utopian luxurious gay space communism idea, that is not only unproven, but so far INVERTED since modern AI can make better art than 99.99% of the population in zero time, but robotics might be decades away from being usable for large projects.
No, it doesn't. Really, we've had the material means to pull this off for at least the last five decades, at least the immediate basics of it, and at this point it isn't even a matter of inventing new shit, but reorienting what we have to different uses. I can actually tell you that in many, many aspects, a communist world would be a lower tech one than the one we have at the moment.
Also the idea that wage slavery is new is absolutely retarded. From the dawn of human society we have worked for some master out of necessity, the fact that nowdays they won't flay you alive for not working and even allow you to have disposable income for private use and choice should be seen as an objective improvement.
We have always worked for some master, what changed are the particulars of it. A slave would work for his master in return for food and shelter, a peasant would work the feudal lord's land (which he would otherwise treat as basically his own, to the point of living on it) by paying rent to him in the form of a part of his harvest, and now we rent our labour-force in return for a wage.
The constant throughout all this is the removal from a labourer of the products of his own labour, hence the slave works for nothing, the peasant loses half his harvest, and the wage labourer, well, at least half of his labour time which goes unretributed.
That this is a "better" arrangement is an idealistic statement and above all a subjective one, I can easily make the case that, since the peasant treated the land as his own and his own labour was far more for his own sake than the modern wage labourer by virtue of, well, not having to move out of his home to work, the peasant was far better off than we are. Work
was life until the Industrial Revolution, inseparable from it, while since the Industrial Revolution our life has been split in two (easily three) parts, a third for ourselves, a third for sleep, and a third, distant from our home, in some dumbass miserable factory or office or whatever, for someone else. Anyway, I don't want to argue on mere opinions.
All this misses the key point, which is that wage labour itself is unsustainable and abolishing itself as we speak. As automation continues
in this world, men are increasingly pushed out of productive jobs, their labour is worth less and less (
not in terms of prices/exchange value, nota bene, or not just in those terms) and so is the product of their labour, both in Marxist conceptions of value and in more mundane conceptions of prices.
In the end, we end up in a condition in which men have no reason to work for a wage anymore because they're unemployable compared to machines, and they have no reason to even buy or sell shit anymore since advances in engineering have allowed it to be produced for less than nothing. Still, this persists somehow with charades like desk jobs, why? Because the system has to perpetuate itself even after outmoding itself, we end up with a conflict between desired relations of labour on one hand and material conditions which prevent their proper execution on the other.
Dude, the other systems ended because they had to end, because they couldn't keep up with technological advances and new relations of labour anymore, that this thing dies as well is nothing exceptional, and not a big deal, nothing lasts or should last forever.
Actually, this isn't up to anyone's opinion or policy anymore, this thing is already a walking corpse, a zombie, and it doesn't even know it's dead yet. The communists are just saying it's already dead and that there's no point in keeping up the pretense anymore.