I will say over time this game has catered more towards the casual and more solo oriented players, and classes have been changed to appease this. So both MMO and RPG elements have been taken away as the classes get more homogenized for casual play at the loss of class identity.
Well we know the reason why tho although I believe nothing really essential was taken away from the old ways since the button condensation is just to make room for more skills as the game code allows xD Mathematically, pressing 1-2-3 or 1-1-1 still takes the same amount of effort and repetition tho. 1 to = is 12 buttons but if 3 actions are condensed each, that's a whopping 36 button potential which would be important to maximize high end duties clears but to the average solo player for the story only where pressing 1 to = is sufficient shouldn't have bothered anyone really. Everyone wins actually? xD