I can't comment on the hobby as a whole. But I play, or have played, plenty of RPGs in which some important characters' principal strengths are not combat - Classic Traveller, Prince Valiant, Burning Wheel, Torchbearer, to some extent Rolemaster, even to some extent the invoker/wizard ritualist in my 4e D&D game.
I don't think that this has much to do with balance, though. The significance of balance - in some sense of a comparable degree of mechanical capacity enjoyed by players, in virtue of their PCs, to impact the fiction of the game - doesn't go away because the game involves situations and conflicts that are not combat-reltaed.