Nothing wrong with min/maxing or not min/maxing. You can min/max and roleplay or min/max and not roleplay as well as the other way around. In my experience the main thing that you want is for everyone to be in roughly the same power level so no one seems useless and you can balance the encounters, from a GM standpoint. Overall while the mechanics do effect the roleplay more often than not on forum roleplay the strongest thing in the game is being a fun person to roleplay with since the majority of the game is non-rolling chatter.