well theres a few.
first mud giant elite was set to impossible for weeks then set down.
next you have black widow queen and tracker give out the same plans instead of tracker also giving out cloaks like you would normally have as the progression
then theres the insane jumps in their power
These are road blocks designed to slow down progression pure and simple.
And what sucks is some of us will get through them and take all teh time needed to do it, then after we have done that they will make these bosses easier or add new heroes that make it easier, so all teh other players can get through these bosses a lot faster



