[Shujin]

I just like to point out that a lot of silences, from other sources than classes do in fact give you silence Immunity (For example Shizumare (I think thats the silence spear) and Tsukikage)

Most classes do usually have a condition to apply, barring Hexer, which has probably the most potent Silence out there. I think this comes with the trade off of being a tactical nuke. Comparing Magic with Standard movement skills and the likes isn't really fair. A well placed invocation can end a fight in an instant or a simple CM Ryemei, and as long as that exists Silence need to exist as counter.

Not to mention that you can still cast magic as a mage just fine with silence on. Throatopeners are also not that hard to get. I do not mind a buff to Throatopener though, I like it when items actually do something good for ya as a limited resource.