There is one downside to buffing disablers. The moment that happens, a lot of the same people who complain about gat/mortar (I don't mean anybody in this thread, I'm referring rather to the type of person who plays one match and decides "HWACHA OP") will start complaining that they can't do anything against disablers, they're OP, they take the fun out of the game, they should get nerfed, etc. Anybody who was around for old fire (or more recently, the old carronades) will know what I'm talking about. Fire was never OP, carronades weren't either. It's just that once you got caught in them and didn't know how to deal with them, you were stuck. Sorta like the current double hwacha Galleon, which isn't actually that hard to deal with.
So yes, I would like to see disablers brought back. I do think it would help balance the game. However, Muse always has to cater to everybody, and sadly I can say from experience that powerful disablers make the learning curve steeper for newcomers.