I feel like all of Azys Lla is (was?) massively underutilized. We go on a tour of the islands while pursuing the Archbishop, meet Tiamat, and have our climactic confrontation in the ARF and Singularity Reactor and... that's it. A magical seal is placed on the ARF off screen, and we go there to punch out the Triad when they start waking up, and nothing else happens on Allag's old R&D Center slash Tourist Haven.
Like... what the hell is the Habisphere about?! It's got an entire control island! What's in the Mobile Supply Cache? Quarantine Block? There's just so much unexplained stuff up there and we spend so little time it's... kind of sad, in a way, that they put it all in the game world and we know nothing about it and have no reason to visit except idle curiosity.