why the devs take the lazy way out on low lvl content scaling?

[Silver-Strider]

3.) In-universe, the reasoning behind it is that when you do lower-level content, you are using the Echo to re-live the experience. Meaning you only have available to you the same abilities you had at the time you first did it.

I am missing quite a few abilities then. I distinctly remember Fluid Aura, Protect, Stoneskin 1+2 and Divine Seal when I was playing ARR on my WHM as well as Stone 1+2 and Aero 1+2 being their own buttons and Cleric Stance being a thing.