Honestly, the idea of LumaFusion on macOS is probably the most compelling reason for me to consider a new Mac right now.
I agree it should remain an iOS-focused app - that's where it's obvious power and competitive advantage lies. That said, the flexibility to use one video editor on both tablet and desktop OSs would be sweet. Both to take advantage of the increased horsepower of the new M-series processors for exporting big projects, but also more screen real estate, and multitasking between other apps.
Probably the main advantage I can see (other than faster, more stable export of big 4K projects) would be to work seamlessly on projects on either an iPad or Mac without fuss. Unless I'm mistaken, LumaFusion currently can only work off a locally stored project file - not one on an external drive? Not sure if that's something that can be worked around into the future, but if a full project could be kept on an external drive... plug drive into Mac, work away.... plug drive into iPad, off you go, etc. I know for someone like me, who's always editing away from home, that workflow would be awesome. I'd pay extra for it too
Bender & Xing - Hiking Videos from Tasmania, Australia.