That would depend - do Dragonborn and Tabaxi only live in far-away lands that are rarely visited by Halflings and rarely visit Halfling areas, or do they live in multi-racial/ethnic cosmopilitian cities?in a fantasy world with multiple races having entirely different facial morphologies I'd assume facial illiteracy would be the default and already incorporated in the insight or persuasion rolls
afterall how is a halfling suppose to read expressions of adragonborn, or a tabaxi who not only have unfamiliar faces but also use tail twitching and ear position etc
That would depend - do Dragonborn and Tabaxi only live in far-away lands that are rarely visited by Halflings and rarely visit Halfling areas, or do they live in multi-racial/ethnic cosmopilitian cities?