The benefit is that most of the time I don’t need to the Google Sheet since I can usually remember the key and it is more for passwords with weird rules or ones I don’t use often.
As for why stateless, it is much less work to get a new machine up and running. Plus, it is much friendlier at my current job since I can’t even send a word doc out to my personal email much less syncing a password vault. Much easier to have one stateless manager and separate spreadsheets for storing metadata.