Right, because computing is full of cross platform frameworks that you can write once and run anywhere and have as great of an experience as native apps - look how great Java and Swing were.

Java powers Android so it seems to work. Also web apps seem to work on Android as well, it's only on iOS that you have this kind of issues.

Android uses the Java language on top of Google's non cross platform framework. That's completely different than using Java with Swing. An Android app is not cross platform.

Web apps on Android May "work" but still aren't as responsive as native Android apps.