I cannot understand where people use...actually use rpi:s.
I have 2, 3, 4 and the small wireless. All of them crashes when left on more than few hours or days. can't use them for anything
I had a Pi 4 home server -- described in the blog post below -- that ran for several years with maybe 2 or 3 unplanned outages in all that time.
I am currently using a Raspberry Pi Zero W as a wireless security camera. It has been running continuously for over a year without a single crash.