Let's flip this around, what are the benefits of writing a native app when there is Electron? It's democratizing cross-platform Dev tools in one of the most standard rich environments, the browser.
> Speed
I'll give you that, but performance is not the most important factor for most users of most applications.
> Native UI
Coming from someone who has done web development and iOS development, who tried native development for osx then switched to electron with react and redux, I have found it faster and easier to completely recreate the look and feel of the native osx views while adding custom functionality than to add custom functionality to natively. Appkit sucks and many of the improvements they've made over the years are only available in recent osx versions.
The development experience is much better using VSCode than Xcode too. That's insane. A 2-3 year old web based text editor should not be a better, faster, and more stable development environment than the 8th version of the of the IDE from the most valuable company on the planet.
I haven't noticed it, and use Atom (Electron based) on a Laptop often. It's a MacBookPro, so already one of the better in terms of battery consumption, but I use it disconnected from Power for upwards of 5-6 hours at a time with no issues.
If NeXT was written after the browser (rather than being used to write the first browser), I believe the OS windowing toolkit would have been HTML and CSS based, rather than postscript based.
If you consider macOS' use of postscript rendering as roughly equivalent to that of what a browser does with rendering the DOM, then I think we start to see what Electron represents.
I personally haven't developed with Electron, but I'm hoping that there are ways to hook to native code where needed, just like Apple does from Postscript to Swift/ObjC/C.
IMO, the question should always be, why native?