Someone already stated that this kind of thing would make races seem more like lists of stats than actual diverse cultures.
It's just a flexible means of implementation optimised for customization.
I wasn't addressing the "why would X not do Y" save for suggesting such be split between biological(can not) and cultural(will not), and giving a few examples for demonstration purposes.
So, if you decide dwarves, not evolving the phenomenal stamina of hunams(if you were in peak condition, you could run(run, not sprint! Aerobic, not anaerobic) damn near any land animal to exhaustion, even death - canids being one of the few exceptions - even if they're faster at first, you could out-last them over long distance. "Run animals until they're too tired to resist" is a viable hunting tactic for hunams), have inferior lung capacity and thus a biological disadvantage for blowguns, you could put that in there. If you think a dwarf civ wouldn't like blow guns for some reason(they suck compared to the neighbouring hunam tribe - see above - and don't like to look bad?), or would see them as a taboo weapon(a race they hate using them is a good reason to demonise them, as well as poison), you could add a further cultural hindrance or even a ban - a ban being for things that a critter will refuse to do. Like you'd prolly refuse to eat the still-warm corpse of your mother, maybe even if starving to death.
Critters doing activities with cultural hindrances would prolly get bad thoughts('was embarrassed to be seen training with an un[man]ly weapon recently'), atleast at first('I'm so awesome I bet I could kill a dragon with this diddly little blow-stick!'), tho some variables related to the why might be interesting, say, for the thoughts they'd get using a wimpy weapon verses one reviled because a hated enemy uses it. As for taboo skill bans, well, maybe you'd see some [dwarves] willing to do it anyway, albeit not without a(n initial?) bad thought, and maybe social consequences(dwarves that feel particularly strongly about their culture/that taboo more likely to form grudges with a [dwarf] they see doing an activity that violates it?)