i can agree to that, but it can already be done with other means... clerics can have mirror image, and druids can get alot of wizard spells as well... dipping into other classes spells is already possible... how much it is done, is ultimatly limited by spell slots and action economy and no matter the number of buff spells, you can only have one concentration spell...
So tell me if you think its such a bad idea, for identity, should warriors be barred from dippin g into rogue to get sneak attack ?... most non caster classes dip into other non casters becouse they gain extra attacks and some really really good features, not only is it idendity breaking it is also really really damn good...
But if caster get some meme versatility, then its ruin and doom... again, your arguing wich cricle is more round then the other circle...
