Tbf, my first foray into reddit-like federated alternatives was Kbin, and that did actually die.
Originally lemmy just did not interest me because it felt like the only early adopters of it were the CS and techbro crowd. But now two years later I'm seeing what seem like regular people that I'm more able to relate and discuss with, with more variety in content and communities available. Plus, I'm browsing lemmy using the old reddit format which I am still stubbornly using to this day on actual reddit. So now I am using lemmy in a format that is identical to how my reddit usually looks. I could have lemmy on one monitor, reddit on the other, and not tell the difference. Maybe petty, but its a big deal for me.
There is still a pretty big lapse on communities relevant to me tbh, but there is still enough to warrant me to visit lemmy more often. For example, I am a historian/museum professional, and the history communities heres are practically dead to non-existent. Many of the communities I am interested in are simply forking posts from reddit or simply posting news article links. But, I suppose that is the part where I stop being a lurker and be the change I want to see in the world. It is a bit more enticing and exciting to make posts knowing that a much smaller but more engaged community will see it. On reddit, it feels like pointlessly screaming at the void.
Regardless, after two years it is kinda clear that lemmy is here to stay. It seems to have survived the great filter that most other federated alternatives did not during the initial reddit api buzz.
Anyways, thats just my perspective as a completely random not technologically advanced person views and viewed lemmy.
Is there any real benefit to deleting the account? I don't see what harm a dead account could do. I have a instagram account that has my real name on it, and I'd hate to have someone potentially impersonate me. I instead posted a link to my personal website and also linked my Bluesky account in the bio, stating that I will no longer be using instagram or regularly checking it.