well, then you are really bad at native and should not be comparing those technologies despite your claims otherwise (which make little sense).
Yikes. I spent 15 years developing native on both mobile and desktop. If you think that native has the same design flexibility as HTML/CSS, you're objectively wrong.
By design, each operation system limits you to their particular design language, and styling of components is hidden by the API making forward-compatible customisation impossible. There's no escaping that. And if you acknowledge that fact, you can't then claim native has the same design flexibility as HTML/CSS. If you don't acknowledge that fact, you're unhinged from reality.
There's pros and cons to the two approaches, of course. But that's not what's being debated here.
They do. But not in the way that you think.
I recently switched from Spotify (well known Electron-based app) to Apple Music (well known native app). The move was mostly an ethical one, but I must say, the UI functionality and app features are basically poverty in comparison. One tiny example, navigating from playlist entry to artist requires multiple interactions. This is just one of many frustrations I've had with the app. But hey, it has beautiful liquid glass effects!
In short: iteration time matters. Times from design to implementation, to internal review, to real user feedback, and back to design from each phase should be as fast as possible. You don't get the same velocity as you do in native. Add to that you have to design and implement in quadruplicate, iOS design for iOS, Android for Android, MacOS for Mac, Windows design for windows. All that is why people use Electon.