
Protoman |

This should be in General Discussion forum.
I'd say probably because they don't automatically assume/pigeonhole one's social identity to be of the nobility. Shopkeep, bank clerk, accountant, etc, they can all be social identities.
Traits are probably expected to provide the background class skill relevant to one's social identity.
Though I agree with you. I think base vigilante class should have a selection of social identities specializations to expand the class skill list and provide a social base ability. Noble would make a great category/specialization.

Budoman |

This should be in General Discussion forum.
I'd say probably because they don't automatically assume/pigeonhole one's social identity to be of the nobility. Shopkeep, bank clerk, accountant, etc, they can all be social identities.
Traits are probably expected to provide the background class skill relevant to one's social identity.
Though I agree with you. I think base vigilante class should have a selection of social identities specializations to expand the class skill list and provide a social base ability. Noble would make a great category/specialization.
I do not think knowledge of nobility pigeonholes a character into being a noble, just someone knowledgeable of noble traditions and bloodlines etc. This basically just pairs with the social grace this class gets. Also as an intrigue character - farmers, clerks etc. have little intrigue. I would think any vigilante or intrigue type would have more than a passing interest in local politics, which almost everywhere in Golarion involves nobility.
If you want a rough and tumble vigilante you don't even have to put point in that skill but it seems if a character wants to go that route and be involved in noble intrigue they are at a disadvantage with out the class skill.
A practical skill knowledge nobility has to be one of the least rolled of all skills. I think in my last year of PFS I encounter only one time where we were asked to roll it - so it would be a very small addition.