This is less fashionable now in the era of Electron apps - users are starting to expect apps that look _the same_ everywhere.

See VSCode, Discord, Spotify...

It's easier to get a single code-base that 'just works' across platforms if you have an abstraction that is truly cross-platform. One of the major value propositions of developing with Electron is this ability to develop cross-platform 'with confidence' - I can build an app on Windows and be 99% sure it's going to look function the same on OSX / Linux.

> I want my macOS apps to use Mac-native UI elements, and Windows apps to use Windows-native UI elements

That's a fine goal but it means you end up needing more platform-specific code. It's a trade-off, and there isn't a one-size-fits-all solution.