One song by Billie Eilish, L’Amour De Ma Vie, has a genre switch towards the end of the song. It goes from Billie's normal song style of soft rock to a club beat through a sort of DJ transition. When I was listening to this song it caught me off guard. I wasn't expecting the style change and I don't really like the ending. I know it was a part of the theme Billie Eilish was going for but to me it doesn't really fit the song if you are not listening to the whole album. Maybe other people like it, but it did not meet my expectations because the change was so abrupt.
I completely agree with what you're saying. The change was very abrupt!