I have mixed feeling on this, because I want access to GMs pretty much whenever I feel like running them, but I also want to feel like I'm getting more powerful for my grind. If it were up to me, I'd just make pinnacle rewards selectable from the vendor. For example: Run three strikes, go see Zavala and he will have 5 armor pieces and a primary, special, and heavy weapon. You pick the one you want. Even if Bungie had to make them all +1 to offset the efficiency of that system. We'd still have a grind, just not a sometimes frustrating one, and we'd still have a power fantasy or whatever it's called.