No. You should play the way you want. If people don't like it they won't play with you. Simple as that. The elitist attitude of this game is even more encouraged by people who just accept it as given. There will always be plenty of people out there with the generic job combinations for you to play with. It's entirely up to everyone who they play with and how they play. No one should play a way they don't want to just because it's 'accepted'. If you don't like it and would rather play the standard efficient way you are free to do so with someone else.

We're not talking about crazy stuff like WHM/WAR (though if you want to do that, go for it), ouchie, we're talking (or at least I am) about the people who nitpick everything to the last detail to make you think you need certain things at certain times to be of any use. Or that WHM doesn't get parties. Or that SMN needs all the avatars at level 1. Those just aren't true. And the people who get so pissed because another person lotted their item, or messed up in a mission. Like, losing friends over it pissed. People need to mellow out more.