Qui-Gon didn’t actually leave, though. He just treaded the fine line between following the Code and listening to the actual will of the Force.

Though yeah, the portrayal of the Jedi in the prequels has given place to this revisionist, critical approach to a overtly dogmatic Order. Personally I’m fine with it, it makes sense how Palpatine preyed on the Order’s weakness to wipe them out, and I liked to see this referenced in The Last Jedi. The perceived hipocrisy of the Order also feels like a more reasonable reason for Anakin’s turn to the dark side (since it made Ahsoka leave, among other things). Honestly I would have liked to see this pay off with a reformation of the Jedi ideology in the sequels
Maybe influenced by the teachings in Luke’s ancient texts, Rey could have gone on to found a new kind of order to correct the wrongs of the old one after Luke failed to do so. Instead the situation was left fairly ambiguous and there’s no sort of assurance that another Jedi revival (or a third Republic, for that matter) won’t repeat their past mistakes.