The one thing about Butcher is that people never abuse his gaps. It's mainly because nobody knows where they are etc, but he has a lot.
Absolutely nothing off his 50/50 is safe. The only exception being f212 by itself I think. Everything else has a gap that can be armoured through as some characters. he has a vortex sure, but it's a punishable one.
One of Butchers things is that people haven't fully explored the matchup against him, mainly because nobody plays as him. I reckon if he gets buffed and more people start playing him, more people will start going through all his gaps too.
He has a strong snowball effect, but I personally think eventually, all momentum will be gone if the opponent commits to a 50/50 direction and is ready for the armour punish.