I don't use the apple podcasts or music apps. (Overcast and Spotify for me). I haven't run into any serious problems.
I have Reduced Transparency, Reduce Motion, and Prefer Cross-Fade Transitions, all enabled. You have to have Liquid Glass set to Clear for Reduce Transparency.
I do use the Apple Podcasts app, but YouTube Music and DI.FM Radio apps for music.
I never see any rendering issues / glitches, and the UI is smooth & snappy.
It's NOT possible to turn LG off in iOS 26. It is possible to reduce transparency and motion (i tried with and without enabling those and it's broken anyway).
Yet that’s still just repairing what they previously broke. I still can’t listen to music AND listen to a voice memo or a video clip.