It would allow SSH if the desktop is locked, they’re separate. If you can get in via SSH then you can poke around logs like dmesg and see what’s up. There will probably be some messages to give you something more specific to search with.

I agree. I have become more amenable to things like Flatpak or Podman/Docker to keep the base system from being cluttered up with weird dependencies, but for the most part it doesn’t seem like there’s a huge upside to going full atomic if you’re already comfortable.