I would like to see a return to the days of Coil. These days, 8-man raids are no different than trials.. and it's not supposed to be that way.
I believe a huge opportunity was missed this expansion, given the environment the raids are set in.. it would have been perfect to actually explore with a group before you reach the boss.
Even Alexander was too linear. Trash mobs were of no real consequence. I think Coil had the perfect formula. They should return to that.