It’s not only that the films have the same basic narrative structure, but the way films these days need to check a series of boxes. You can’t have just an action movie anymore, it also must contain a romantic subplot, charismatic antagonist, light humor, diverse cast, visual effects, international marketability (topic not narrow to one countries audience) etc.
Before we had the same basic recycled narratives, but a film didn’t need to check every single box and some films were more directed at romance or certain audiences and only checked a few of these boxes.
Modern tent poles need to check every single box and it just feels so formulaic and boring.