I think you can boost the HP pool of the bosses so players get to see more mechanics. I've never really been bothered by it being "boring" as many claim. LotA is one of my favorite ARs from an aesthetic and variety point of view. ST is... quick. WoD is a bit dull primarily because it takes a while, and the slightly tricky mechanics are trivial once you know them. The final boss would be a lot more interesting if more mechanics appeared.
I think one of the bigger issues is the difficulty jump between CT and the later ARs. But I doubt SE will smooth that curve simply because CT is required content and the rest are not.