Hey,
Let's be honest : 99,99% group quests are pointless and undoable at the moment. I remember at launch in 2008 it was fairly easy to find a whole group with tanks & healers and do the quests, I did them all with my very first character back in the day.
Today, most folks level their character alone, and I find it dissapointing to have to delete these quests as they look fun, even the places where you have to go (e.g. Conall's Valley, a huge part of the map with only Ymirs Elites).
How many people trying to level up ask for a group in order to kill Torgrim but just fail because nobody is available? I think it will be a good and simple idea to convert those elites to normal mobs, and make these quests still have a meaning (and be useful to anyone) because as it is right now you need to be way higher level than them to complete the quest.... on your own. Which is in my opinion a bit silly (even you do it for a specific skin).