Android Studio/IntelliJ may be excellent to you, and I'd agree the IDE is better than XCode as far as slinging code into an editor is concerned. However the Android development system isn't just the IDE: it's the build process, integration with debugging tools, and the APIs. Java doesn't have to be a bloated mess of over-engineered cruft. I've seen wonderful, clean Java. Android development is the opposite of that.
Kotlin may be great. I haven't used it much, but so far I'm finding it can't hide Android's bloated, over-engineered substructure.