Hi ! A reddit user (u/selflessx45) posted a cool concept for lockscreen notification's background having a blur instead of just being transparent or solid . One ui 7 is really focused on adding blur across the system so it feels weird that you guys didn't add blur for notifications . It looks  more pleasing to the eye and has a much more modern look. I hope that you can take inspiration from it or that it can help you to improve the next one ui even more ! Thanks !