expectation failed

Are you referring to generating CSS code or their own CSS (design) on the website? For the second, you can try it with the GPThemes browser extension

I couldn’t agree more. Hmm. Maybe OSS Weather [fdroid link] has a radar map, but it didn’t provide much information. Unfortunately, I don’t remember

The Breezy Weather (fdroid link) is a fork and continuation of GeometricWeather. As I can see, there are hourly forecasts for the next days, just scroll horizontally (AccuWeather and Open-Meteo providers, tho, I haven’t checked others).

If you are a Florisboard user, there is a version with dynamic Material You themes here. It’s really good while we wait for the new versions with this official built-in