Respectfully disagree, It isn't about badwrongfun or that some people are very skilled with the system/character rules in an RPG. Speaking from experience, it comes down to having a player in a group, especially if they join a pre-existing group, who wants to do the +3 to +5 on the optimization when everyone else at the table prefers 0 to +1 (using the scale discussed earlier). If that group is happy with that basic level of optimisation but the other player ruins the experience at the table, then it causes problems. In my experience, that optimising player won't come down to their level but expects the other players to up their game to theirs. It isn't badwrongfun but it does breach the unwritten (but hopefully spoken) social contract of the gaming group.