i actually consider it optimal to split the party's damage, since there are several enemies in the game who are either highly resistant or even immune to certain damage types. you'll also have characters with no armor of a certain type and high armor of another. your overall damage output might be lower and fights might go a bit longer, but you'll have a better time CCing everyone, which is really what this game comes down to anyway - always having a way to exploit an enemy's weakness and then making sure they can't move once their armor is gone
your results will definitely vary depending on who you ask, and some people still swear by the 4 physical damage party setup. if it works, it works
