This is one of the things that I loved about Shenmue III. Just like in the first two games, there is a ridiculous amount of optional, easily missed dialogue when speaking to different NPCs at different points in the story. Way more than you would expect from a crowdfunded game, especially when it's all fully voice acted in two different languages.
I know some people will say that it was a waste of budget that should have been spent on more important aspects of the game. But it's one of the truly unique things that I love about this series. It makes it feel like Ryo is living in a real world inhabited by real people. And Shenmue III really exceeded my expectations in this regard, considering its tight budget.