I understand you like the whole freedom to choose and having been playing since the very beginning i was at one time all for Classes but it seems some where down the road between having to level x y z Classes to get everything, picking the same actions for mostly all the Classes. Many actions dropping from my consideration list due to potency loss during the switch and some actions being downright useless because the developers had built every endgame encounter to bypass them, Decoy and Dreadspikes i'm looking at you..... I'm just underwhelmed by the current choice we have it seems like a fallacy.
Atleast with a more well defined system you could cut all that fat from the game that seems so pointless right now and let players focus on enjoying the game at their own pace rather than having to worry about all the different Classes they will have to level to get the ultimate soloing/etc build which is often 1 or 2 actions from near enough each lol. If they could some how reconcile all of the Class system's current issues and build in some real choice/strategy i would be all for it. Like say i'm Lancer, natively i only have physical attacks but the opponent requires that i use elemental attacks and through the Class system and possibly gear/point allotment i can use Elemental attacks/abilities from other Classes at full potency to dispatch my foe efficiently.
Though thats only an example i could support a system that could give me bigger differences in my action list depending on the situation provided the Classes still remain limited in some way to prevent them becoming what they were in the beginning. As a player if i could choose between FFIX's or FFXII's Character systems i would much rather pick IX over XII, each character has a clear playing style instead of just ending up being Onion Knights(able to do just about everything equally and respond to everything with the same abilities).