Right. In the OSR with its “zero to hero (or at least greater zero” aesthetic, it’s assumed you position in society at level 1 is “not great.”One other thing careers offer (and something the 4E added some system mechanics around) is your position within society I.e. social class. This is something a “fighter” in OSR doesn’t really include.
I can see the appeal of incorporating more varied social classes among PCs. I remember from the early WH books that your initial career was randomly rolled; is this still true in later editions? And with a variety of social classes, how do you in-game arrange it that a noble, a merchant, and a latrine-digger all spending time together and having adventures?