Can we let shields stack?

[Karshan]

it has NO mechanical reason to exist

Untrue. Examples were already given :
- vulnerability debuff : it's meant to punish for not doing a mechanic correctly. Allow shield stacking, people will cheese anyway possible (people will try not to ? LOL remember skip soar ? It's a meme now)
- Some effects (such as some bumps) are only applied if you take more than 0 damage (I'm sure cause the guy wrote > 0 instead of >=0 lol). For instance, Sophia head bump. Allow stacking, and some of these mechanics become non existent.