MR isn't a problem, only when sets reach the 300+% area is it too much. Hitting probability wands exist for a reason. I think a more acceptable fix to MR stacking would be to have the MR skills rely on magic for skilling (i.e. 50 mag for 100% mr skill.) The main problem with legion was that people had absurd MR manu sets that wouldn't break and that most mages weren't able to get much over 150 magic while still being able to survive any long term PvP versus a warrior.
Also please for the sake of balance people, remember this is not a 1v1 game. It's based around teamfights, and MR sets have a very important role in world PvP. Getting pfa'd one time and then having all of your armor broken even with an MR set on would be stupid as fuck.
why make HB 1vs1 Street fighter style.....
is just plain stupid
Group pvp is where its at!!!