Hopefully a future book gives them some details. For now I am ok with using Humanoid Statblocks.
It's funny. As every one of the D&D 2024 books comes out, I've heard people say "maybe the Dungeon Master's Guide will have it" and then "maybe the Monster Manual will have it". We can always expect another book they may or may not put out but it constantly gives them the excuse for not having done it with the books we just bought.
It's fine that you're cool with it. No one needs to feel any certain way about this. I think it gives them a free pass to assume that anything missing in the $150 of books we just bought we can get if we just spend another $60 in the future.