The native side of this has long been addressed by cross-platform toolkits including but not limited to: Qt, GTK, FLTK, WxWidgets (note: all FLOSS, at least optionally). Alas, web development "decided" to completely reinvent the wheel for all this stuff, leading to a new generation of heading-to-native toolkits derived from browser-based technologies, such as Electron, React Native and Flutter. Unless you believe the…
The native side of things has been address very badly by cross platform tools. I don’t want lowest common denominator shitty cross platform apps.
"Highest common denominator" doesn't make much sense in this context - it's functionally equivalent to lowest common denominator.
You want N different implementations, 1 per platform?
You think the cross-platform toolkits could be better? Do you have an explanation for why they are not?