So rewrite the game in a way that will punish everybody including people who never PvP?
1. Those buffs work to create a difference because abilities aren't balanced for PvE and PvP differently.
2. Impenetrable armor trait.
3. This will punish player in dungeons and trials to address something that isn't and issue in those environments.
4. Animation canceling is part of the game. Has been officially embraced by Zenimax since 2015. Removing it or breaking it would change the way the whole game is balanced.