Simpler for players to understand, not simpler for developers.
I'm not hugely opposed to your proposal, I just don't see the need for it, plus it's a bit unelegant. We've got this system of how talent trees and points work; do we really need to add exceptions?
I'm of the opinion that the few L6 talents we have are already intensely confusing for the average player, given how many times I've had to explain them to people.
And there's only about half a dozen of those.
Still, you guys go ahead and theorycraft a system.
If one of you actually wants to make this idea, instead of simply
suggesting, in a vague and general sense, well over a hundred changes (Either in the form of single unique category bonuses on catpoint, or in the form of an L7 skill effect on at least one talent in every category.) in order to balance a fairly minor element of gameplay (Changes that, in order to do properly, you really need to know how every single class in the game works, well, lest you produce large imbalances.), I'll give feedback on it then.
I sure don't want to. Nor do I think it's worth it.
Or even especially interesting, to be honest-it produces linear, easily judged single-bonus choices instead of actually having to look at your skills and see if the category point impact is worth it, and seems very prone to someone finding ways to game and abuse the system(Because someone screwed up and made too good of a talent) or not caring(because someone didn't). That's just my opinion based on the theory, though.
(The linearity can, in fairness, be avoided by adding a TL7 effect to every single talent, at the cost of greatly increasing the chance of something overly powerful slipping through.)
Maybe give no mastery bonus, but increase talent cap by 2?
Hmmm...I don't know. I think it mostly magnifies the possible risk of raw talent skills, while not really adding much.
I mean, I see where you're coming from; You get more impact out of the intrinsic category rating you have already, which is pretty neat. But between the higher raw talent risk and the fact that you're making the category a much larger Class point sink, I'm not sure it's an improvement, per se.