Spell Sever is not so much anything to do with class balance though, unlike Divergence. If anything, it's a nerf to squares, since many don't train spells and thus can only wear two.
But as for the issues with X/day items and spell sever - That's not so much a class balance issue if you ask me.
I do get why they want spell sever, because they are trying to introduce challenge that can't easily be circumvented through pay to win. But ultimately I don't see why they can't adjust spell sever and still obtain balance.
I think one of the important things here is to divorce Divergence and Spell sever in these discussions, unless there is some other pay to win issue with it that I am not aware of. Simply complaining to Wyrom about 3 issues you have with Divergence, is meaningless with the X/day issue, because that is spell sever and not Divergence.