I also run Umbrel under Rasp Pi 4 with 8GB and it goes smooth like silk. No problems whatsoever on anything: hardware and installation setup, software installation, running apps, etc... ZERO issues.

This switch from one OS to another one is pretty normal in techies personalities (me included). I am resisting myself to do the swap but i still havent found a solid thread to do so. There are always trade-offs in each direction.