As a sorcerer, it is entirely possible there will be one school of magic you just don't have any use for.
You are right. But that's not my point. A sorcerer can pick his spells from any school if he wants. With this, he is just not allowed to.
As a wizard, it is entirely possible there will be one school of magic you just don't have any slot for. So they give up the school they won't use and gain benefits. The sorcerer don't have the benefits, but still has to choose a prohibited school since the beginning.
Of course, this will not ruin the sorcerer build of any one, but it still limit it. Limit without some tradeoff.
Just pointing that once again, no love for the poor sorcerer. Anyone knows why WotC hates so much sorcerers and monks? (they would be very pissed with monk/sorcerers
