One thing that prevented me from looking at getting into native macOS development has been that lack of good development resources or training. Every time I have looked at getting into it and start asking around I hear things like "Oh, just learn iOS development and start from there..." or "Just learn Swift and see where it takes you." If there were more learning resources available (and I admit there may be some incredible ones out there that I'm just ignorant of), I think it would still lead some to be interested in the platform.
I've dipped my toes into Mac app development and had the same experience as you did. Forget good resources, a lot of AppKit APIs have no documentation at all. This makes me understand why JavaScript is winning here - for all its faults, there are plenty of resources to pick and choose from when it comes to learning javascript.
