Why doesn't pve have pvp combo structure?

[ItMe]

There are ways to work around combo trees; just leave the alternate finisher or alternate route as separate button(s).

The only situations consolidation wouldn't work for are ones where you'd want to start your combo over again without finishing it, and I can't really think of any situation where that would be a good idea.

Yeah, being able to push 1, 1, then one of 3 other buttons is def a nice workaround. Heck, if there are more buttons for bread and butter attacks maybe we could get more elaborate combo trees like we used to have. I know tanks used to have a debuff combo, and until ShB they also had enmity combos too.
Would you prefer the extra hotbar space go to more room for the trees? Or would you rather they use that real estate for something new?

You can't think of any situation where it's a good idea?
How about the example that's come up, what, thrice now about breaking your combo as PLD to immediately hit an add or a new boss with a DoT as soon as they spawn?
And I know as WAR add phases and awkwardly long untargetable animations sometimes cause me to break my combo just to keep my buff active.

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;

Sure, but let's go back to talking about combo trees as most jobs are not 1 2 3 in PvE.
Unless you feel they should become a strict 1 2 3 in order to fit into this system?