I don't think you understand...what is a Sorcerer going to do with invisibility? Nothing...it's a ranged caster that strikes from distance and does not gain any benefit from stealth and doesn't even have the damage dealing capabilities to reliably activate stealth. It's a total waste. You can try to force it but it will only cause problems. Especially on tactician where you want enemies to die as fast as possible you want to put that on a character that a) reliably activates it and b) benefits from invisibility for more than running away. It's a total waste on anything but a rogue. Sorcerer is more of a AOE, battlefield control, support class.
I understand perfectly well what you're trying to say, it's just that I can't possibly see what you're saying being an issue when I've seen invisibility used to great effect in the EA game such that a solo character can take out the githyanki patrol with reliable results on various classes, namely
sorcerer.
