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The idea that hundreds of sapient species are unable to field one of two members that can interact with society at large breaks verisimilitude is why I put zero value in the concept as it applies to D&D. It's just shorthand for 'I don't like it'.
When The Good One ended and none of the good promises of the Next Playtest didn't materialize, I hung around a bit to see if the whole 'modular' promise was going to happen. It quickly became clear it wasn't, so I floated off to PF2, but PF2 has Vancian Casting and at the time still pretended...
Yeah, but the assumption is that the Pretty Folk from the PH will eventually drive those guys to extinction for the crimes of not being pretty, not being in the PH, and for thinking all their wealth and land belong to them and not the Pretty PH squad.
That's on the DM for not giving them bonds beyond 'people shapes like you exist somewhere for some reason'.
Ask the player about the character's family, friends and past. Dig into their backstory that THEY created.
Don't just grouse that the player is rearranging the Hummel figurines in...
If a setting can be broken by one wierdo (the single character it takes for a player to play a species) hanging around unharrassed, then imo, that setting isn't resilient enough to be exposed to player characters.