Nah I sunk many thousands of hours into these accounts; definitely not a small cost.
Sure I could get a new account and pay twice for the game I already purchased multiple times - that would’ve ground my gears too
I think the new account would have to be a Microsoft account also, so you wouldn't have even gained anything by not migrating.
Some servers allow joining without a Microsoft account even these days, but probably can't play on any of the servers you regularly play on, if you don't have a Microsoft account.