Welcome to the forum and to EndeavourOS!
Well, sadly, EndeavourOS is based on Arch, which can be high maintenance distribution if you go nuts and do a lot of weird stuff. If you just want to set it up and forget about it, you can do that relatively well.
This is a thread that should be a must-read, in my opinion, regarding running EndeavourOS, more or less, trouble-free. Obviously, things won’t always be sunshine and rainbows, so be prepared for anything, but following the advice here reduced a lot of issues I personally had with Endeavour. Remember a few key points:
- set up btrfs snapshots (here’s the guide I personally used. I’m sure it is outdated, but it works still)
- update once a month
- don’t install things you don’t absolutely need
- set up sysrq in case the fickle finger of fate decides to hand you a bad time ([Tip] Enable Magic SysRq Key (REISUB))
So, to answer to your question, I think the answer is no, you don’t need to constantly maintain the OS to use it, but at the same time, be prepared for anything since this is a rolling release.