the way i see it the vast majority of 1-2-3 combo's, if not literally all of them, are no more complex or involved than just hitting a single button over and over. They are a time gating mechanic, not a skill check. You get the resource to do the real thing on the 3rd part, I couldn't even imagine a situation where even a small combo efficacy bonus from resetting to 1 manually would outweigh losing the third part resource.
In my mind reducing them to however many buttons as their are branches would only accomplish a single thing, freeing up prime button real estate for the actually interesting parts of a jobs mechanics.

either that or cut out busywork stuff like the 60s buffs and just rolling the potency into the 60s skill rotation. they don't really serve any purpose either outside of a button that lights up to tell you start the burst without needing a stopwatch or somesuch
honestly, i don't really care how they do it. Button bloat is getting out of hand and my arthritis would far prefer a heavyhanded approach then back off a bit as necessary rather than pruning 2 buttons just to add 3 more