We forget that our "antiquated 'class' system" started in exactly the same way.
Knights got knighted because they went off, killed loads of people, renditioned people, stole resources etc. And so on with all the titles.
All courtiers got jobs for the boys, and for the sons.
Marriages were brokered by ambitious men who used their daughters and sons.
All of our aristocratic, aristocratic adjacent and royal families come from stock that was willing and able to kill and steal for advantage.
Fine manners and decent clothes hide that.