True, but umbrel runs on separate OS using containers. StartOS is the OS (also free to downlod) and can run on any x86_64 machine, so you have better hardware than raspberrypi, which is not good for server and is more insecure. Any old computer with startOS will likely be better than raspberrypi with umbrel. I’ve run a decade old nuc and a raspberrypi side by side, no question raspberrypi is miserable with both startOS or umbrel.

StartOS on an older computer would be better than anything on a raspberrypi.