To be fair, 90% of NPCs in most games aren't directly related to any main storyline, and their dialogue is often background flavour at best. So replacing their

To be fair, 90% of NPCs in most games aren't directly related to any main storyline, and their dialogue is often background flavour at best. So replacing their one or two lines of non descript dialogue with a possible conversation would do wonders at increasing immersion, and allow effort to be spent on more important characters and content instead.