For example, if you have seen Get Out, go back and watch the trailer. How are you supposed to immerse in a movie when you know who the bad guys are upfront and what the whole twist is? (If you haven't seen Get Out, I recommend just watching it knowing it's a thriller)
Infinity War did some interesting advertising where they changed scenes intentionally so you couldn't follow the timeline in the actual film. They "lied" in the trailers, but I think it worked out for the best.
- The original trailer: https://www.youtube.com/watch?v=bEVY_lonKf4
- David's intro from Weyland Corp: https://www.youtube.com/watch?v=RJ7E7Qp-s-8
I know it's kind of a lame time to rant on this subject. Obviously trailers are popular despite how I feel. For example, I'm probably the only person in the theater that closes my eyes and plugs my ears for previews that look any good (not just thrillers), so I certainly don't think your project is a bad idea.