I was thinking on how everybody is super tanky nowdays in pvp and I noticed that everybody is using medium armor only, no matter what, even if you are magicka user or tank you still pick up medium armor. Therefore one could test if people would actually use both heavy and light armor if their armor ratings were affected in pvp. It would create argument where 'if armor is weak then you might as well go full dmg and pick up light armor' but also 'if the armor is weaker then you want to heavy armor to get as much resistances as possible' and both of those arguments are correct. How does that affect tankiness in pvp ? people could still be as tanky as right now but they would have to use heavy armor as its intended use, meaning that you would need to trade survivability for dmg. But if people will pick heavy armor which has downsides against magicka users who use light armor then it would create a counter. And since light armor would provide less protection as well penalties against physical damage then it would make an opening for medium armor users to counter them instead. And medium armor would struggle to pierce through heavy armor due having less penetration and heavy armor having upsides against physical damage. The aimed result would be people actually having a rock, paper, scissors counter scenarios against each other which is how game was intended. The reason why its not the case currently is because you can easily get near resistance cap by simply having medium armor and both minor and major resolve.
Another thing is that since penetration doesn't require to be as high people could spec more to spell and weapon dmg which, yes, would make people deal more damage but also heal more so people are more likely to die but also more likely to recover if someone were to dodge, block or avoid at least some part of the damage.
The end result would be that both average pvper as well 1vXs would both die but also kill more, make people use all 3 types of armor instead just medium and maybe even make less people discouraged from avoiding pvp if they could feel that they do infact have a fighting chance.