Because it's not exactly a server, more like a home PC that I also remote into. And not doing anything super processing heavy on it, so any cheap one is fine. Usually SSHing but sometimes VNC which is annoying in Linux. The Mac Studio use case is that except yes heavy processing, but I've never needed that. Tiny power draw is nice too.

I also have a new RPi. It's still too slow as a PC or server, and the random issues with Linux software on ARM aren't worth. Like oh, there's no arm64 bin for this thing so you gotta build it, and the libs are harder to find, and oh turns out the code has a race condition that only gets triggered on arm64...