>people's saves and earned content like game unlocks and achievements aren't lost.

What does that even mean though? A piece of paper or digital equivalent that lists your in-game achievements? That's worth... a piece of paper or digital equivalent. I mostly don't even get the equivalent for lots of things I spent a lot of time on in real life. I guess I have a diploma somewhere though I don't actually know. (That is at least somewhat verifiable without the original piece of paper.)

I certainly don't expect "achievements" like that to be transferrable other than in a generalized life experiences sort of way.