Do you talk about “wearables” = “skins” in this context because you use your statement also for weapons ? At the moment i can’t remember any reference that there WON’T be progression for weapons / stats eg. We know (as you said) for sure that wearables (skins in this context) will be horizontal and won’t show progression.
This quote from @ben (if i read is right) clearly confirms progression of stat-items like armor-rings and therefore i’d assume the same applies to weapons.