Most casuals can't just 'pop a 3oC' and get whatever they want...If you don't play much, strange coins aren't THAT plentiful. You aren't guaranteed an exotic when you use one. The GHorn chase in Y1 was kind of fun, though (only because I finally got one), and it was kind of cool when Xur mattered (nobody really gives a shit what he brings now bc we have everything).
This board is kind of the tip of the Destiny spear, so to speak. Once you have ALL exotics, the game is going to slow down, for sure. Bungie has to have some kind of balance, though, because people would be pissed if there was some UltraHorn RL that required 100 hours of grinding... Not everyone can do that.
The exotic sword quests were a giant pain in the ass - something that required a LOT of time, even for people that play a lot. And I loved grinding away at them and finally getting all three of them. I think quests like that are good for the game and probably take the right amount of time.