Historically, how a society organise its social hierarchy matters a great deal for many pre-modern cultures. But while societies might differ on how its social classes of people is divided, there is still a sense that different classes can have different attitudes and rivalries with each other.
Say you offer a government office to someone of a non-noble class, the nobility will likely be in uproar over it because they are being excluded from office. If you offer too many of the high-ranking offices to your noble, there is a danger that it might be used to legitimise their position as a rival candidate to your throne.
Class should matter in CK3, and the background of the people you employ for certain council positions or political offices should matter in the game.
Say you offer a government office to someone of a non-noble class, the nobility will likely be in uproar over it because they are being excluded from office. If you offer too many of the high-ranking offices to your noble, there is a danger that it might be used to legitimise their position as a rival candidate to your throne.
Class should matter in CK3, and the background of the people you employ for certain council positions or political offices should matter in the game.