I don’t know man, those are some strange behaviors. Can’t say I’ve experienced any of them. There does seem to be a common theme of slow and delayed responses, that is almost certainly a hardware issue from my experience, but that doesn’t line up with the specs you mention.

Regarding the privilege issues, running a general user without superuser privileges is a standard practice for Linux. You can change your user to a superuser though, there are plenty of walkthroughs available to accomplish that. That will keep you from having to run sudo, doas or enter your password as often. Some things will always require a passcode though, as that’s just what the best practices of the tech landscape indicate.