In this case it was literally because I just did one example for each stat & looked at the map coming up with reasons that might improve a stat till I had one for each stat to make an example. If a player asked me why that was I could think of a bunch of reasons why that might be the case & would be happy to work out something with them using those or maybe even something else that fits the setting but we are really getting off track.That's fine, I just would object to the idea that the background description of an area would trickle up into game rules; such that characters from eastern Karrnath make better clerics than characters from western Karrnath. If the player doesn't know a lot about a prepublished setting, we work out a good backstory that ties into the setting in session 0.
@Phoebasss "Most players would just take the +2cha one for a primary charisma based class or ask the gm if they could work something out ". there are any number of reasons why a GM might want to link a particular culture with a particular attribute but a player working out something with the GM tends to be happy to work with the gmin exchange as a few people have pointed out how the player who wanted a particular culture/attrib combo could attempt.
@TwoSix a 15 becomes a 16 when you take a half feat that gives +1 to that stat, I've seen a lot of players start with a 15 intending to even it at 4
