I loved FFXI for one reason and one reason only ... BST. The ability to solo level was just great. FFXIV ARR solo levelling is boring compared to the excitement of that.

I personally think MMO's should come with the ability to solo all content as well as the ability to do it in parties. That way people who prefer to solo things can complete everything.

InB4 but MMO = Parties. No MMO = World full of people to interact with.