Simply put, Adlo/Stoneskin/Protect don't stack for the same reasons that Dragon kick, Virus, Eye for an Eye, Storms X, Foes, Paeon, Ballad and so on don't stack. Allowing these kind of abilities to be stacked would potentially break encounters amplifying the 'flavour of the month' effect that for the most part this game tends to avoid.

SE have openly stated on many occasions and via many raid mechanics that they want groups to bring a spread of jobs. Your 'idea' goes completely against this and thus is never going to happen.

So yes, it is too much to ask.

And just because it's hilarious coming from you:

Quote Originally Posted by Vlady View Post
or change the system to never pair scholar together please.
Ok