I don't know what sort of bubble people live in, or if people convinced themselves that a computer getting slower over time because of OS clutter is normal, but every Windows PC I ever had had shit ton of problems, getting slow to the point of feeling like I have a $100 laptop instead of a $2000 one being the most common.

And can't say MacOS is much better, at least judging by my gf getting freezes all the time and having to reboot by holding the power button.