I started out including a non-combat skills-focused character, but later found the companions you can add cover a lot of those loose ends. Anyway, the wide array of skills-based activities should provide more replay value. At least in theory.
We're not doing a PC version.
Just kidding, it's coming to PC as a free update on October 13th worldwide.
I can't follow your reasoning here, as I would say again that the skills in W2 are differing enough to be counted as separate skills. You can lump them together, it may even make sense to a limited degree, but the question would be why. Because not only are you giving the player the chance to invest heavily or lightly into skills, you're even giving them the choice as into what aspect of the skill (the theoretical "phat l00t skill") they want to invest.