Faolyn
(she/her)
I've found there are two types of players: players who will play any race--because they haven't played it before, because they have a great idea that relies on that race, because they want the class/race synergy, etc.--and players who only play as members of a particular race or group of races. Yes, there are players who, for any of those reasons, play halflings. I've said it before, but I knew a guy who would only play halflings, unless kender were an option, in which case he'd play a kender.depends on one of the great questions do you have a player who likes halflings? plus given they are in the player had book refusing them can get heated as without some trust removing things gets difficult.
And there's nothing wrong with saying "in this world, these are the only PC races." If you have a player that throws a fit about that without a really good reason for it, then they might not be fit for that game.