1- daily heroic features new content. Thats why its not available anymore. You still have all those missions still. 2- those lvls have changed to the new light level system which falls under the whole max lvl is only in ttk which you said you were fine with. 3- all that stuff is outdate and all new stuff is out. Vanilla destiny weapons and armor were replaced in TDB and weapons and armor available in TDB was replaced with new gear from HoW. Samething has happened here. Which your required to be lvl 40 to use new legendary and exotics. 4- it all falls under the new level/light system in place and max level is only achieveable with TTK expansion. Its an ever evolving game. This will happen with the next dlc/expansion.