don’t know why you’re getting downvoted, they gave legacy users literal years to migrate
I really don't care about Microsoft's maintenance costs. I should be able to play the game I paid for 20 years from now without having to jump through hoops in the intervening period. It's not my fault that they decided to make my perfectly normal account a "legacy" account, that was their decision.
It would have been better if they hadn't required you to migrate at all. And a lot of people, including me, ran into issues during the migration process. Thankfully I was able to get it sorted out after contacting support, but other people weren't so lucky.
They should have made it a seamless transition for legacy users.
I just downloaded a game I bought on steam 12 years ago and played it. I hadn't really thought of the game in the intervening time. If this had been minecraft, I'd have had to pay for the game again because I didn't convert my account.
But no, subnautica was ready to go, though the base building was just as buggy as it was before.