So your sollution to the armor system being bad is spells that ignore the armor system?
Don't you kinda make our point?
We already have em, Piercing attacks.
We just don't have enough of em to make it armor-pen a viable strat.
See what I'm getting at? If armor penetration is expensive compared to direct damage then people will have to choose which situation to use which. That is what the game needs to capitalize on. Add more stuff to introduce more viable strat instead of just trying to revert everything back to old "CC them with RNG until it works".