T DC:
Becoming free of mental afflictions and confusion definitely helps one function more effectively in the world. At the same time it reorients your perspective so that the conceptual benchmarks of success and failure have less of a stranglehold on your life.
Well, just to play god's advocate here, what if
both of those factors contribute to worldly success? Being a chilled-out mofo helps worldly success in an obvious way. What if being unattached to worldly success helps us get it, rather than hindering it? This is fairly obvious in sports, where if you are too attached to the outcome, you strain and try really hard and make a mess of it, but if you just enjoy yourself, you perform better. Same in interpersonal games.
What prompted this question was a challenge I have in my own practice. The third school appeals to me philosophically, but I've found it can add an 'agenda' to my practice; my intention is no longer entirely on grasping the truth of the situation, and that adds a disruptive element to the mind