I have a high-end laptop from Asus (no plastic etc) that I installed ubuntu on. It would overheat, have issues with the drivers and just simply would consume more power. It'd maybe last for an hour, while on windows same processes it would last for two and a half. No matter how many hacks I had to google for and how many hacks I tried, still nothing worked. You've wasted six hours, I've wasted a month trying to optimize my laptop to work at 50% of what it did.
I have had a Mac as well that I sold in a heartbeat, because it required an upgrade that I simply was not willing to pay for. For less than double of the amount of money it required for an upgrade I got 32GB of RAM, 512SSD and a neat i7 processor, zero plastics. Mac would also overheat and would also crash, your point? Plus the support in the region where I am located is ZERO.
No I'm definitely not going to miss the keychain as I have last pass that handles just about everything nowadays.
I also work on Python, postgres, ansible, redis (which has limited support on windows but still works). Not sure where your problem is.
So there's also the other side of the coin, plus your isolated case + opinion does not prove the "ZERO quality" statement, just like mine doesn't that's it's good.