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

[Silver-Strider]

The point is to balance the jobs (roughly) around each other and not have one glaringly stand out from the rest, which I would say they have achieved

I'd argue it could still be better. Apart from the ST damage being within close proximity to one another, there are still other factors to consider.
DRG's AoE rotation is no more or less powerful than that of MNK or SAM but they have those skills prior to level 50, so couldn't they be brought down to a more reasonable level?
PLD is lacking mitigation/healing in comparison to GNB so would lowering the level of Bulwark really make it that much better? Same with Oblation on DRK
Would having Rapture/Solace on WHM prior to level 50 really change how the job performs in comparison to the other healers that already have their sustain tools and more oGCDs to boot?
Other areas of balance can still be addressed, even if the whole rotation can't be brought alongside it.