I have LineageOS on my phone and noticed the media player has the wavy progress bar on it. Not only that, a lot of music players also have it and lowkey I personally don’t like them. I find it hard to position where I actually want to be in the song and I just don’t like the constant movement. I rather a normal progress bar but that just a personal choose.
I have found the wavy bar to be both aesthetically displeasing and functionally worse. I have a harder time understanding where I am in a song or podcast and feel like changing that position is harder since the position doesn’t visually track with my finger directly. Very frustrating all around.
As someone else said, it would be a cute thing for a single app, but it should not have been made a part of the android design language.