I am somewhat new to the game still, and have soloed MRD to 37 and GLD to 16 in an effort to unlock Warrior as my first job in FFXIV.

I was curious what other classes would be beneficial/required for party and/or endgame use. More specifically, what actions should I be aiming to unlock for use as my limited number of "Actions permitted from other classes" while playing as MRD/Warrior?