the problem with trying to make the scope FFP is that the reticle will wash out at low power, so with FFP you should be using higher power with it anyways why not just hit full power with it. I don't take long range shots and at the same time use the features of the reticle without being at max power. in a perfect world who wouldn't want a reticle that stays the same size in all powers but there are definate down sides to that.
34mm tube size also has nothing to do with increased light transmisson this is a factor of objective lense size and glass quality. Its an interesting market for these I have to ask how many people are buying these uber tactical scopes ie the 34mm tubes horus reticles etc. must be something as bushnell and leupold are almost exclusively focusing the new product in this area. I personally would think a nightforce with a 40mm obj in say the 3-15x range would sell more scopes for nightforce, but then again what do I know. maybe its a function of price with a scope that costs 3 grand you only have to sell half as many vs the regular NXS model.