[VvR-Ox]

Yes that would be awesome!

Unfortunately the providers of the OS'es we use don't bother with this.

What would the world be like if you could run anything anywhere and most importantly: how would you decide that you prefer a mac to a windows-machine?

I think web technologies are a bridge that many like to use because of the sad state of things in the UI domain.

[s_y_n_t_a_x]

Microsoft maintains it's own fork of react-native that allows this. https://github.com/Microsoft/react-native-windows

There's more experimental forks for macos and qt.