So I don't think ME into WoB was broken in the vacuum. It was overpowered in a combo with harmony mechanics and the combo of 1) decent control with 2) amazing point slams and 3) good engine overload tactics. If a deck has all three it will likely be op.
it wasnt broken on its own but like you said it put 4 engines on the board in an all-out engine list. nerfing ME (not in provisions, lol) would have been the way I'm 100% convinced of this. the row locked change made it unplayable, especially with many harmony cards having different deploy abilites on rows, like willow, hawks etc.
