One thing I love about the pvp system in FFXIV is how they setup the combo system where skills move from one to the next.
I think 6.1 shows how that it doesn't just make it press one button to win, but there are so many times in pve that we have 3 to 4 spots taken up, when it could be shifted into just one spot.
In the end, I would support this just being an option for players if they wanted skills not to stack, but figured I'd bring this feedback back up in hopes of it being considered for an update in the future.