It costs more to build native UIs, that’s true. But a project like this specifically seems to have most of the secret sauce implemented in a cross-platform lib

It costs more to build native UIs, that’s true. But a project like this specifically seems to have most of the secret sauce implemented in a cross-platform library. That seems to be to be a great application structure and candidate for native UI implementation. It increases the development effort from n+m to 3n+m, where n is hopefully much smaller than m.