I do see your point, but I personally don't see how Fighting adds to the goal at all.But that can easily be left to the ability. There's no point in voting ground because it's immune to electric if the ability would make it immune to t-wave anyway. And I believe it will because otherwise we stop a maximum of, say, two secondary effects (assuming ground type and flash fire or an equivalent ability), which doesn't really fulfill the concept.
Plus I find it silly to have a typing that doesn't really contribute saying that "the ability will do it for us".
There's only so much an ability can do, and the typing should be helping towards this goal. I think that just saying that the ability will do it for us is just putting off the goal until later, and just giving it a better overall typing now rather than taking account of our goal.
I do understand that an ability can help, but I find it weird for our typing to do so little for our goal.