I don't mind the movie rehash. The manga's pretty easygoing for now. That's all fine.
But I gotta say:
It's hideous planning on the part of the marketing team. Just inexcusably bad. I want to know if there are precedents for this kind of sloppy story arc planning in the industry, because I'm confounded by the logic of this.
I understand that if you haven't seen the movie, they need to reintroduce it to you, because it's been decided that the movie has to be canon, because a lot of people's interest in Boruto comes from the movie.
However, why make the movie before releasing the manga? My god. Now a significant portion of the fanbase has to spend at least a few months rehashing a story that they already know, and spend time looking at inferior scene-rips from the movie before the story becomes truly compelling (the movie's plot is not really all that compelling on it's own, even). If they had done this in the opposite direction, people would be appreciating the manga more for its seemingly new plot direction, and the movie would have been hailed as a great adaptation of the manga which only required 90 minutes to consume. Moving in the opposite direction, from a 90 minute product to a months-long adaptation that seems to add nothing new, is beyond illogical.
The obvious answer is that they made the movie before they knew they would be making the manga, but that's bad planning. If they knew they were making a manga, they should have made a movie about literally anything else, and then done Boruto: The Movie as a movie adaptation that would still have sold well because people wouldn't mind watching a 90-minute adaptation of something they've seen in a manga. That's always appreciated.
That said, it's probably to give the mangaka some practice and gauge interest in the series before they move into investing in Boruto merchandise and spinoffs in the future. But christ, what a way to treat the audience.
