I have a LG plasma TV from 2008 that still works great. It's not a smart TV so I don't have to worry about keeping it up to date or having it slow down. I've gotten more than my money's worth.
I have a Samsung 1080p non-"smart" tv that just won't die. Sure, it's not the best picture available, but it's good enough for what I need and doesn't send my viewing habits to any motherships.
Plasma draws the pixels, so it does native resolution with no interpolation for all its supported resolutions. Is that correct? If so other than higher power draw suggests that is ideal.
My understanding is that plasma panels have a native resolution, similar to a LCD panel. If that native resolution isn't the same as the input resolution, there's typically a scaler in the plasma display that will massage the content to fit, very similar to a LCD panel.
Plamsa panels were commonly available as 1920x1080 or 1366x768. As long as you're watching natural images (movies etc), both are really fine; native 1080 line plasmas are a better fit for computer generated imagery because they're much easier to feed at their native resolution and avoid the scaler; a lack of 4k plasma displays isn't really a big problem, 1080p is still beautiful. Plasma screens don't have support for HDR, but they do have amazing black levels.