I'm not disagreeing with the idea of condensing them. The whole idea of having branches was to offer agency, notably for tanks between aggro generation and damage, and on most melees (including tanks), dot uptime. Now that all of this is gone, the combos retain no purpose beyond tactile feeling, which you'll agree is still different from spamming 1, and I do feel that's the kind of design the devs are left with in the past expansions, the same way that DDR is DDR: it's all about pressing specific keys at certain times like you'd play a music sheet. It's not about agency anymore.

That's why they don't want to consolidate them into a single button, it would ruin the DDR.