Why doesn't pve have pvp combo structure?

[ItMe]

I think managing enmity is boring and I'd rather the space go towards more elaborate DPS combos for tanks, if anything. Even if they didn't add anything new, however, just freeing up the real estate is still a win.

Yo I feel you here bud.

As for the rest, I'm not sure if I'm quite understanding the problem. The PLD DoT and WAR buff are both alternate combo finishers; you don't have to break your combo to execute them, and breaking your combo wouldn't allow you to execute them faster.

So as PLD, if I see the target is about to disappear (add about to die, boss about to become untargetable, w/e), and know I have 4 GCDs left, I can go 1212......3 instead of 1231......23 and taking an extra GCD to DoT the target.

Or for War you can do the opposite and break whatever combo you're in so you end on 3 to refresh your buff before downtime.

It's not supah phat tech, it doesn't change your parse to any notable degree, but you're not gonna find a very deep reason to push 123 differently.
So here are a few examples of small situational reasons to break your combo. I'm sure I could think up examples for other classes, but I don't play many at a high level lol.

Are these niche situations worth keeping 123 over 111?
I dunno.
But again, that part of the convo isn't what I'm here for lol