Sadly my problems are with buggy applications, and hdr (more of a monitor issue than plasma itself). I’m hoping these get patched as more people yell at bad wayland support and poorly implemented hdr.
Somehow, under GNOME things “just work”. Or at least it doesn’t take down the entire session.
At one point in time, I was obsessed with getting a Thinkpad to the lowest power consumption possible.
I think I managed to drop it down to ~3w, with the screen and radio fully disabled.