You can of course scroll backwards or forwards using the mouse-wheel or scroll bar to revert to the currently selected style.
With more than 10,000 styles, it is very difficult to find the music style that is playing by moving up and down. Because if you move a little bit, you jump a lot.
I don't see the benefit of removing the refresh button.
However, I see a lot of downside to removing the refresh button.
If the BIAB team doesn't restore the refresh button, I've been discussing it on this post.