I've tried straight party challenges, but I usualy find them borring. For me tweaking my party is a major part of the game I enjoy, and you don't need to do that when everyone is the same class and they all master it fairly early. I usually just pick a handful of classes that I limit myself to for the playthrough.

Really, games like FFT, ones so open ended with how you set up your party, seem like best suited for video game challenges. Do you think so?
Absolutely.