Things changes yes, but we can see the changes now : Arathi humans have the Kul tirans models, therefore confirming that it is just a body type for human.
It confirms variety in human models, yes, but Arathi aren’t quite human, now aren’t they? They’re half elf and they’re from an older bloodline of humanity, plus we don’t know over the millennia of their history if they’ve also married themselves to other races. Ultimately we assume they’re simply Thalassian/human hybrids, but they can have more than just that. Remember there are known, knowns, known unknowns, and unknown unknowns. You assume that we know all there is to know of the Arathi. I do not.
In the heads of the devs, they are, they completly treat them as such in how they think of them. In lore they are not fully humans, but it clearly not change the fact that the writiers and dev team see them as such.
Thats where i think you miss understand the drift, the difference between lore and gameplay and concepts.
Thats just so wrong, like, i really dont get, in what way the Arathi are of an older bloodline than others humans, all humans originated the same way, and actually, the others humans only lived with humans, while the Arathi mixed with elves, so no they are not of an older bloodline.
They trace their legacy at the origin of the human kingdoms, but bloodline VS culture dont really work, its not because you claim to be the heir of the romans that you have blood connection with them, thats the thing. Its like if you told me that Italian had more claim to say they are romans than the others parts of the old roman empire.
So yah: your line of thought is completly messed up and i feel like you dont even know the difference between a bloodline/genetic and cultural claims.
Arathi (both the originals and the current empire) wouldn’t be any bigger than other humans on average because unlike the original Flesh-Cursed vrykul transition from metal to flesh, there was no gradual decrease in size when humans came about. Northrend’s vrykul (specifically the Dragonflayers, as there’s no indication that any of the other vrykul clans - including Northrend’s Winterskorn - began producing human descendants) just suddenly started birthing fully “stunted” human infants that only grew to adult human size. There wasn’t any in-between period of vrykul generations becoming progressively smaller until they “became” humans. The entire first generation of humans were already human-sized, despite coming from from full-sized vrykul parents.
Lore-wise there’s no definitive statement of any Drust/human intermarriage and the bigger human model for Kul Tirans is just that; slightly bigger and stockier humans.
Which would be fine if they were all just the size of the player model, but people tend to theorize mixed Drust ancestry in Kul Tiras because a whole bunch of (specifically Kul Tiran) NPC’S with that body type in BfA are also so huge that they tower over the other Alliance races - including night elves and draenei - and are at least as tall and broad as an adult male tauren.
It hasn’t come up in the lore, but when a noticable number of non-lore-protagonist NPC’s are randomly far bigger in overall proportion than other similarly non-lore NPC’s around them of the same race, it outwardly comes across as potentially deliberate.
In the same vein, if half of the guards in Frostwall had been scaled up to use models twice the height and width of the rest, it would likely have had people wondering if there were some sort of half-ogre Mok’nathal situation going on.
None of this is to say that some Kul Tirans turning out to have mixed Drust ancestry to explain the cases of such extreme size differences among them would be a bad thing, but as things stand, it just isn’t officially recognized as such in the lore.