Yeah, exactly. There's all kinds of complicated factors you have to balance! Like, it's less common now because global connectivity has improved significantly, but back when I was working for LiveJournal, we always called one of the scenarios we'd use to test policy proposals the 'Christine' test: we had a volunteer named Christine who went to volunteer with the Peace Corps, and for those two years she was deployed she could only log in once or twice a year, had no real access to email, etc, etc. So any time anyone brought up a suggestion for a way to reclaim inactive accounts, we'd be like "okay, but the specifics of your proposal would mean Christine would have come back from her volunteer deployment and found her account was gone", heh. People suggest all kinds of ways to reclaim usernames from people who aren't actively using them, but there are just so many scenarios where that is a bad idea that we eventually went "we could maybe prevent MOST of these bad outcomes but it would take a lot of effort and the risk of getting it wrong is high enough, and the impact to someone if we did get it wrong would be bad enough, that we're just not going to go there".