I do wish there was more 4-person content progression, for smaller groups of friends. Something challenging and requiring coordination, like Coil or EXs, whereas 4-person dungeons are designs to be more casual.

Afterall, for endgame 8-person groups we have hardcore dungeons like Coil, trials like Primals, and even casual dungeons such as CT/Castrum/Praetorium. I'd love to see more variety in the 4-person content than just HM dungeons.