I have somewhat mixed feelings about this suggestion. On the one hand, I don't like the over-simplifying effect, where you don't even have to think of which skill to use next. But on the other hand, for controller players in particular, being limited to only 16 available actions before having to switch cross-hotbars is awkward enough on some classes that anything that condenses them better could be a real improvement. Overall, I think wanting to conserve cross-hotbar space wins out, so I'd like this change.