Like; the would be wizard player wants his character to be an outcast from a warlike straightforward group, and likes WoW orcs - so WoW orcs are those guys in your world. The would be ranger likes halflings, so you have halflings, but the would be bard likes kobolds, so your world has kobolds. And then you model your villainous raiding armies or long forgotten ruin builders off your PCs, throw out a few more non player sapient species, call it a day?
@vahnj right! and then hey, there are kobolds as the small nimble trap species where most settings have halflings, gnomes, goblins etc. then I’d ask if your kobolds were little dragon guys with the conference of actual dragons *or* if they were small scaly dog ‘bolds *or* if they wanted to be dragon servitors or something even different. And what you’d say would be the campaign setting, though I might throw in say bullywugs as a rival small nimble trap group for story complexity.
@vahnj (*confidence* of actual dragons, bus + autocorrect)
@Leucrotta yes except always kobolds,