TY for the re-cap. There's also the added strawman issue that the whole strawman to your last point assumes that a "combo" being say, 1-2-3, inherently provides meaningful gameplay over just having 1 button that is not a combo (and hence 1-2-3 vs 1-1-1 would even be a thing compared to just having, well, 1).

Which in most cases its not. This is especially obvious for Samurai where the 60s CD even flattens the combos including all their effects down into single buttons, which means their effects aren't inherently needed on different stages of a combo. By comparison a meaningful combo is something like the Red Mage one, since it goes through actual stages: 3 short-GCD melee hits -> 2 ranged normal-GCD AoEs -> 1 ranged normal-GCD line-AoE. This is more than one effect, so while an autocombo could (and probably should) exist for it, it's inherently a combo.

Now of course the cool animations exist and I like them, but gameplay wise in particular most tank/melee combos provide no reason for them to be a combo to begin with, independent of whether it is on a single button or multiple. And hence the shift to a single button cannot dumb anything down, as there is nothing to dumb down.