While Yesterday is a movie with a few issues, and one divisive scene, the music isn’t one of the film’s problems.
The idea that the songs written by John Lennon and Paul McCartney would be hits regardless of era or performer certainly feels true having watched the movie.
While the Beatles were no strangers to using technical trickery to enhance their songs, most of the numbers performed in Yesterday are much simpler, and the performances are better for it.
Clearly, the decision to keep the music simple worked.