Learning stuff is a weird primary motivator to read fiction.
(I’m not sure you learn as much as you think; I mean some context leaks through but Austin’s characters aren’t necessarily _that_ archetypical. If you want that you might be better with a social history.)
Sometimes it’s the fiction itself along with other commentary that helps you understand the historical background. There’s plenty written about Jane Austen’s novels.
Also, Austen was definitely commenting on society of that time, though sometimes you need other background knowledge to get the reference.
(I’m not sure you learn as much as you think; I mean some context leaks through but Austin’s characters aren’t necessarily _that_ archetypical. If you want that you might be better with a social history.)