Luke lost both the man who raised him from birth and a father figure in A New Hope. He lost his birth father in Return of the Jedi.every post-prequel Star Wars film has had a main character lose their father so maybe in this Han loses his mentor because CHARACTER DEVELOPMENT
Obi-Wan lost his father figure in TPM as well. And Anakin lost his mother in AOTC.
So yeah no it's not a post prequel thing. It's a Star Wars thing.