Mobs Blocking Ranged Attacks

I dont know if I'm just an idiot or if this is a serious issue. In PoE 1 obviously you could roll maps and stuff and avoid ele/phys reflect. In PoE 2 now there are shield mobs that can leave their shields up the entire time (issue with players using shields as well). Why isn't there a stamina bar or something so that mobs and people can't infinitely blocks and mobs can't reflect the damage? I Googled etc to see if other people are having this issue as ranged and was not able to find anything. When I played melee it wasn't an issue but any ranged character I just end up killing myself in the campaign etc on these shield mobs.