1. Personally, I found that when you cover a song using a style, that the audience doesn't react the same as hearing a sequence that songs like what is heard on the radio.
So, I have no problem using a midi sequence.

2. Styles can not handle a " bridge" to a song.

As an example ( I do not perform this song) but Stair Way to Heaven has a slow part, than changes to a fast part or Bohemium Rapsody as another example.

When entertaining, the customer like's to identify the song.