Anyone who is reading the OP as wanting to press one button to execute three actions is reading it wrong... or is willfully making a straw man argument... I don't know.
PvP has you press a button once to execute one action, and again to execute the follow-up(s). You are using the same number of button presses. One way you press three buttons once each, the other you press one button three times; allowing you to pause the rotation to do other actions, then return to it. It's not different, you're pressing a button the same number of times.
But whatever, everyone has their way of playing. I enjoy playing on a controller, so having this as an OPTION in PvE would be welcomed.