I wonder if the game would be drastically improved if there was a resistance to physical attacks.
Not to attacks that hit physical armor... just weapon attacks (maybe even split between piercing and slashing)
Not really because it requires rebalancing the combat as a whole.
I will say the flaw exists because the game has been simplified to the point there's almost no strat to the game combat. Nearly everything can be solved by brute forcing with more damage and that's sad for a turn-based game.