Let's redefine "damage taxes"

[CKNovel]

"Difficulty is subjective"

Yes, do tell me how running is easier than walking. Hint: it's not. Some Jobs are factually easier than others, just the truth, deal with it

We're getting to the fun part.
Walking is easier than running but you're picking 2 examples that aren't hard to begin with.
Both requires the same thing: Alternate the movement between your legs. The difference is the speed at which you do so.
The complexity of "walking" and "running" is the same, the difference being speed..

If we were to take your example, your DPS rotation is nothing but pressing buttons and higher APM jobs are harder as your complexity example is the speed between each buttons.
Which means, by your very own logic of walking and running, MCH is hard and RDM is easy.
And according to you, that's a fact.

Your next line is "Positionals are hard"