I really wish I wasn't "forced" to buy this DLC to have access to all activities... I'm just glad that having up to the TTK content still leaves me with a lot of game and activities to complete.
My buddy who didn't get TTK (he only has first 2 DLCs) logged into the game and he could do basically nothing... for a non-subscription game, there is something fundamentally wrong with that, IMO.
I can't do all the daily stuff, but I don't usually bother with those anyways. So for now I'm good. I could play a lot more Destiny just with TTK.
So does RoI have additional quests that unlock additional missions on the maps, or not? TTK has a lot of that... which is pretty fantastic.