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

[Silver-Strider]

But then that would just kill meaningful character progression with leveling. I mean I know this game already heavily triviliazes character progression to be so easy but do we really need to butcher the rpg aspects even further?

If by "meaningful" you mean all the rehashed skills that they've been returning to jobs over the years that had gotten cut.
My WHM hasn't gotten any meaningful character progression since HW as everything else, barring 3 skills, is a rehashed version of something that I either already have or lost in some way in the past with minute differences.
Temperance = Divine Seal
Divine Benison = Stoneskin
Aqua Veil = Protect
Afflatus Solace = Cure 2
Afflatus Rapture = Medica
Afflatus Misery = Aero 3

That leaves only Thin Air, PI and Lilybell as the only new skills that weren't already accounted for since HW and Thin Air was lowered down to 58 so it's already available in HW. One could even argue that Lilybell exists to serve as a replacement for scenarios that were previously handled by pre-nerfed Thin Air+Cure 3 spam but being locked away at level 90 means it can't even be used in half of those scenarios in the 1st place so it's even less useful in that regard UNLESS a low level version of it was available.

This might only be true for WHM but strictly speaking, there are a number of skills that could easily be brought down to a lower level without much issue in regards to balance since they were previously balanced with other skills and abilities being available at the time.

the real lazy thing would be level cap rotations being simplified to 1-2-3 with one or two OGCDs acquired by L50, and then just making you stronger by traits like "skill 1 becomes SUPER skill 1" or "all damage increased by 10%".

This is literally MNK past level 60