The launcher, which is written in Go and C, is precompiled, so it can be reused in all apps. This means that, unlike jpackage, which requires you to build the Windows installer on Windows, the Mac installer on Mac, etc..., you can build for any platform from any platform.

The idea is to fulfill the promise of WORA all the way to deployment. Everything is built and configured in a cross-platform way, and then is deployed as first-class native bundles on each platform.