I wouldn’t say energy usage/efficiency is super high on my list, but I am also not opposed to being somewhat conscious about that. Basically, a little bit extra on my electric bill won’t kill me.
Separate servers is also something I would be fine with. The Pi has been great, and I figured I could keep utilizing it the way I have been with some other services. It is currently running some form of Ubuntu server (can’t remember off the top of my head), and everything is containerized.