Did the Ukrainians use the Wrong Tanks? Maybe a lot more smaller lighter cheaper machines?

Well, NO, but certainly their experience with hyper expensive Abrams, Challengers and Leopards was not a good one. Why this M41 tank could have saved a lot of money, maybe a few lives and in the end made no difference at all in the coming defeat. We take one out in city combat at the end, it does not go so well. Just some alt history thinking here.