What you need is a balance. You need content for casual and hard core. There are times when you need some quick little things to do. But at the same time, you need a whole lot that you could never dream to solo as well. XIV needs more monsters dedicated to groups which hit about as hard as something solable, but have 10x the HP and give much better xp rewards. That and some leves and quests which just can't be soloed. The GL difficulties just don't really allow you to accurately set it. There's some things that can be soloed at 5Star no problem, and other things that can't be done at 1 star with a full group. I'm looking at you evil Miqo'te poachers around Camp Humblehearth...