I think that's what a lot of people got wrong about the whole topic - the claim mistakenly being that most people think in complete sentences.
Personally, my thought process feels a bit overlapped - a combination of inner visualisation and some form of 'inner speech'. Obviously it's hard for me to conceive what it's like for individuals who have no ability to visualise images, but I'm not about to label them as subhuman troll people. Likewise for people who don't really use any inner speech - I'm horrendous at mathematics, and it's a completely alien process to me in terms of how people hold complex numbers and equations in their head. If we didn't have these divisions in terms of thought process, we wouldn't wind up with specialists in fields of architecture, engineering, graphic-design, programming, etc.
The bizarre bit as you pointed out, is when people don't have any of that. People self-reporting that they operate on an almost purely instinctive basis, reacting to situations out of muscle memory more than anything else. Which, to me, sounds like how a wild animal operates. That's the bit that disturbs me, that there's people fundamentally missing the cognitive element that defines us as human.
There's certainly people in the world who are cognitively incapable of it - where I get a bit lost, is with the whole NPC angle. It's really not clear if it's an innate inability with them, or - like you're angling towards - a passive apathy towards even trying. 'Thinking' often involves challenging yourself - breaking down ideas, and rigour-testing new ones. I'd wager a lot of people spare themselves that hardship purely for the sake of social cohesion/comfort.
I’m not entirely sure about the last part. I think it’s familial.
I am constantly thinking - constantly. I think in insanely vivid images and in long dialogue. Either way, I’m always “on.” It can be frustrating being lost in thought because I sometimes have little awareness for what is directly in front of me. I’m literally watching a screen of ideas or having an internal conversation.
However, when I ask people around me “what are you thinking about?” The answer is almost always “nothing.” And not nothing as in, I don’t feel like talking or It’s personal. They mean nothing as in NOTHING. Which links back to the animal instinct, lump of meat operating on a primitive level idea.
I’ll get hate for this but whatever: I used to think this phenomenon was a “male” problem. As in, men just don’t think. That’s because the women in my immediate family all agreed with the observation that men tend to having “nothing” in their head for the vast majority of the day - save for what might be right in front of them. (Aka, “I am driving.” “I am filling paperwork.” Is all the thoughts they tend to have. Nothing new, fun, creative, or hypothetical.) When asked for creative inputs or ideas on business, innovation, politics, philosophy, etc etc most males had nothing to say. When pressed, they literally couldn’t come up with ideas. Their brains just didn’t operate like that. Of course there were a few exceptions but they were the exception.
The problem is that I didn’t know many unrelated females to sample as well - except females in my immediate family. Now that I’ve talked to and worked with a lot of women, I know it’s not a male dominated problem. Instead it’s a problem across the board. Remember 70% have no thoughts through our a given point in the day? 70% of the world is “S” according to Meyer-Briggs, which I think is the same demographic.
So, that leads me to believe that there’s a largely genetic or familial component. You’ll see that NPCs breed NPCs either by nature or nurture. Families that are a bit more eccentric, odd, pioneering, or entrepreneurial will beget children in the same vein: non-NPCs.
There are some flukes, obviously. But it appears inherited. And This isn’t directly tied with IQ or intelligence either. Or even political persuasion. The eco-warrior, frog venom huffing hippie can be just as non-NPC as the conservative military kid, for instance.
Also, the non-NPCs will tend to be in higher positions of authority, power, or wealthy compared to NPCs. I thinks it’s survival strategy adaptation. NPCs survive, as do non-NPCs. They just choose different routes.
NPCs can’t become “not an NPC” because there is something fundamentally different about their brain. It’s not a lack of effort. If you force an NPC to generate thoughts they become frustrated, stuck, and annoyed. Their brain is developed for what is in front of them and for taking orders.
So with that information, the best we can do is control what programming we send to the NPCs (in a happy world: by a quality education and honest/healthy media.)
We have neither. So we’re fucked.
Anyway, this is just a shitpost theory of mine. I’m not particularly sentimental towards it.