Pretty much the same experience here. During my first week of full-time Linux I managed to break KDE Plasma with a widget IIRC and AI was able to tell me which file in .config I needed to delete to restore to default.

Virtually nobody is going to run kernel 7.2 on a 90s CPU without a time stamp chip. Its good practice to prune old and largely unused features once and a while

Depends on the security configuration of wherever you need to log in to. My work’s was set to disallow custom ROMs, but we also have to use MS Authenticator for a few things and that works fine. Currently they have me set on MFA bypass while they decide whether or not to allow custom ROMs