My first Mac ran Yosemite but I had a Hackintosh that ran Mavericks. Also, I believe I have "touched" Mountain Lion and emulated Snow Leopard. So the first OS X I actually used was Mavericks.Did you ever make prolonged and in-depth use of any earlier operating system on anyone else's Mac?
With respect: if you lack those experiences, then you can not properly appreciate the perspectives of people whose judgements of Yosemite and later are based, in part, on those experiences.
Regarding your last statement; I have used Windows since Windows 95, so I still have a lot of experience with computers and desktop OS:es. So although I don't have much experience with OS X, I still know a good OS when I see one. But like I said, I am not saying that people have no right to complain about the direction in which OS X is headed. All I am saying is that there are people like me who just arrived and who like the current versions of the OS. Would I have felt this way if I was a long time user of OS X? We will never know. But as a long time user of Windows, I can't say that I am disappointed.