> I don't think there are more than 1000 people worldwide who have shipped a moderately complex mac-native app within the past decade.
This is grossly mistaken.
The Mac App Store, which is only 11 years old, is by itself empirical refutation of this claim.
Also, I believe your claim is also mistaken that "Apple itself uses webviews for complex UI in their desktop Music app." Where do you get that from? I don't mean to be rude, but your other comment "I've mistakenly conflated Electron with webview use" strongly suggests that you're not technically sophisticated when it comes to analyzing Mac app binaries. No Mac developer would ever make that mistake. (I think we can safely assume that you're not one, considering that you think there are only 1000 worldwide.)