My understanding of the Goblinoids comes first from Rankin-Bass, and second from D&D; the GW flavoring of 5 (Troll, Hobgoblin, Ork, Goblin, Snotling) was a different take, one I use only in GW games...
For me, early on ('81-'86), I used the pig-faced Orcs in D&D, very Bakshi LOTR '78 influenced, and goblins weren't diminutives, but something else, with hobgoblins being man-sized goblins, and both g and hg being drawn from Rankin-Bass Hobbit.
Once I did consolidate them, circa 1987, in my games, I made the Orks essentially Homo robustus, with hobgoblins being subspecies horribilis, goblins ferox, and orcs robustus. Elves and Dwarves also in Homo, each a separate subgenus, with a diminutive elf-hobbit as the other elf species, and dwarves and gnomes sharing a subgenus. Humans, halflings, and lesser giants being subgenus habilis...
ElfQuest enters around 1986, but wasn't an influence on my game worlds until the 90's.
I didn't encounter Warhammer until about 1988...
Next time I run a homebrew D&D world, I intend goblinoids to be 3 subspecies, but not in Homo. No, they're Australopithecus orcanthorpus. HG as A. o. horribilis, Goblins as A. o. ferox and Orcs as A. o. hominis. Close enough for "good enough in the dark of the cave" in both directions.
But Hobbits get to be small, fast, and vicious... and are H. dimidius...
Elves & faeries get moved to an entire different regime... dwarves to a another one...
And bye bye to the half-things. Save between Orc, Goblin, hobgoblin, human, and halfling... Since they're all tribe Hominini...
But they all got pulled through cosmic rifts from other worlds.