iPhone 15 Plus:

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.

I'm not sure if you're an iphone user or did you root your iphone?

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).