I miss the days when operating systems were really just a simple platform to run applications on. Like I remember back in the day using Windows NT 4.0 and then Windows 2000 and there really wasn't that much there. They had relatively small installation footprints and if they were just sitting there you could look at resource usage and there would be almost no CPU usage, no HDD activity, little RAM being used. You could look at the running services and there would only be a few running services and you could easily identify what each service was doing. You could fire up a packet sniffer and nothing would be happening.
It just made everything easier. If a machine was unstable it was way easier to hunt down what was causing the instability because there was just so much less going on. If you were security hardening a machine, the attack surface was so small that it felt a lot easier to know what was going on and to secure things. Nowadays I look at the services running on the average Windows 10 machine and don't know WTF much of the crap is even doing. I fire up Wireshark and there is all kinds of traffic flowing even though I am not doing anything.
I get that everything is a trade off and that there are legitimate reasons for a lot of the changes over the last few decades, but I really miss the days when things were simpler.