> There's a reason Chrome is mostly written in C++.

And for that same reason, you don't see many apps do the same thing. Any time Chrome needs to request a permission (access files, location, etc), it _has_ to use the system-provided Java APIs.

> Even Google's own Flutter uses a C++ engine to run Dart applications.

As do most games, so you can essentially think of Flutter as a game engine that renders apps.

> Android's JVM system is a collection of Java wrappers around C++ libraries.

As others have mentioned, this is very much not the case.