Fine, I'll elaborate.
You can go to mid ti the moment you hit 101.
Nobody is going to laugh at you or blacklist you from a party because you don't have aoe buffs the moment you hit mid ti. In fact, most people in mid ti are still fumbling through the game themselves.
You'll gain job exp from share party exp right away. You'll probably even be job 4 or higher before handing in, and certainly 6 or so by them with any sort of luck. By the time you finish your first mid party, you'll already have one of the "expected" bishop skills if not 2.
The main reason people want bishops is the healing. Not because they need the heal, but b ecause they can't or won't afford potions.
In fact since most bishops are fumbling their way through ro still, the average party outright assumes you can't handle things alone and universally wants 2+ bishops before they embark. So even if you don't have praefation, the other one might.
Edited by Jaye, 24 July 2015 - 12:34 PM.