The thing is, for gear there is no "glow" version to augment to, augmenting gear simply unlocks the exact same model with the same texture and allows you to dye it, with no added effect on top (the only exception being Prototype Alexandrian and Alexandrian gear, as far as I'm aware). So this problem doesn't exist in that situation.
For relics, as shown in the diagrams, in some cases there is no intermediate step between Step 1 (undyeable) and Step 2 (dyeable BUT with glow).
If you look at Stormblood relics, it makes sense that the initial "Antiquated" step can't be dyed, but the next steps (relic, +1, +2) can't either, while the "Anemos" step can, but immediately comes with a glow.
If you compare it to how Heavensward artifact weapons used to work, "Antiquated" weapons couldn't be dyed, but once you augmented them (which is now available from the vendor by default) you were able to dye them (on the other hand, the relic steps using the same model but with a glow can't be dyed...?).
And again, if you compare the intermediate steps of Heavensward and Stormblood relics with the intermediate step of Shadowbringers relics, something is off.
Both Heavensward and Stormblood allow you to dye the intermediate step as soon as the relic changes its model, but for some reason Shadowbringers... doesn't.
So it seems weird to me that this is all "working as intended", when the progression of relics and their switch from undyeable to dyeable (to undyeable, in the case of Shadowbringers) is clearly inconsistent between expansions.
