They basically hit everyone with that change.
Those who don’t have these heroes and have little chances to get them will only get annoyed by being obliterated by them more often.
Those that do have these heroes will have to basically pay same amount of money again to get the costume and get their power back to stay on top and not with some half-baked shameful version of a hero.
Those that do not have them but could try to get them will be like “well maybe let’s just wait until ALL the legendary heroes from this event get their costume before spending any money on it, because what if Marie-Therese costume proves broken OP in the future, I want to pull her with the costume version and not this nonsense she is now.”
There is basically no player group that could be happy with this. Maybe except the ones who just enjoy watching the world burn.