i mostly use nightly/fennec but i so wish that they'd do a proper tablet ui. i love using firefox but using it on tablets compared to edge and chrome is so painful (especially now since edge canary on android is testing mobile extensions).
"Maintenance mode" is fine by me. The constant insistence to change things up for no reason other than to make "progress" is so frustrating as a user. If it works fine, there's no need to push for constant changes.