you can make stuff up all you want but half or more of the game is hidden behind spells, and the most versatile characters fall ever so slightly behind the most dedicated focused ones in what the dedicated focused ones specialize in, with out giving up all of there versatility. I don't call that balanced at all.
the fact that MULTI full casters can go level 1- level 10 with the same number of attacks same damage on melee attacks as the fighter AND still have there spells is something that speaks for itself... but when Adventures in Middle Earth made non casters, they took BARD, took it's spell casting and said "Gee without that it is 98% balanced with rogue and fighter" shows a bigger issue.