

Framework makes it their point but also charges for it. Some big make laptops also allow to upgrade parts.
But lets not forget Linux specific laptops. They generally allow upgrading ram and storage. Slimbook even sold me a newer (but also new) keyboard when mine gave up after 5 years or so. Most parts seem to be available still.
Some brands to look for in this group are Tuxedo, bto, slimbook, starbook. Clevo might work too.
Having experimented with this a lot, I’d say it depends :P
Keyboard only you can get by with 5fps or so, but there’s no real feedback at that point.
15fps is ok and quite usable. Artifacts are the more annoying thing at that rate. 30fps is really more then necessary (though I agree higher is nice on lcd displays).
What bothered me most is the limited contrast, pixel density and limited amount of colors on color eink display.