I'm all for experimenting so no objection from me. We have an hour of previews as it is. Why not remove 1 for a recap? You could even mix it up with each segment being a unique style to that arc. Antman2 outright had a character do a recap in the middle of the film. Put that guy's voiceover at the front. How about an opera in front of Thor? 80s music video in front of GotG (oh wait, they did that AS AN AD!) Stan Lee himself should have done the avengers."Previously, on Battlestar Galactica..."
A 10 minute recap would be nice to at least tell the audience the cast of characters and the current MacGuffin.
It would help a lot of people. I don't find the Marvel series to be very memorable and have probably only seen GotG more than once. Probably because it works as a stand alone film despite the stuff that only exists as worldbuilding for the MCU slowing it down, whereas most of them don't work on their own.
Cinematic Universes are starting to feel like homework.
Just don't cut into the movie's runtime.