No, what makes it interesting is that the choice to use the druffalo exists. Quite a few gamers on this forum never thought about using Duffy as an de facto fifth party member to help close the rift. Just like quite a few gamers never thought about giving up to Ser Cauthrien in DAO completely missing the prison break sequence.
First let me say that the original point I was getting at was that the druffalo didn't make the quest more interesting just because you could exploit him into closing the rift. The choice exists to solo it, avoid it all together, closing the rift with an all mage party, etc. doesn't make the quest any more interesting. It adds nothing to it besides exploiting a way to close a high level rift at a low level.
Secondly, the sequence with Ser Cauthrien was a scripted part of the game that happened based on the choice you made. Whether it not a player discovered that, it was still a written part of the quest.
The druffalo quest has
nothing at all to do with the rift and I highly doubt he was meant to be. To say: "The druffalo quest is interesting because you can exploit his God mode." Seems a little bit desperate. I mean, to each their own and all, but I don't find that closing a rift with the druffalo interesting, I like a bit more meat to the actual quest-- I can close the rift anytime and even they become boring and tiresome after seeing them everywhere, yet rarely do they bother anyone.