Building a cross-platform UI with support for theming, layouts, accessibility, high-DPI, internationalization, and lots of targets is brutally soul-crushingly hard. It involves a ton of the sort of work that is absolutely not fun and that therefore programmers have to be paid to do.

How would you propose funding such a thing?

Or would you like to volunteer to spend every waking moment of your life fixing bugs like "your layout manager misaligns buttons by 1-2 pixels but only on my system when the moon is full or on 64-bit CPUs in the Northern hemisphere while using Arabic languages."

That's what working with UI/UX is like, especially if you support... well... really anything other than native macOS on systems sold by Apple in the last 4 years only. It's why FOSS has never crossed over into the mainstream in any meaningful way. Making software is fun. Making it polished, pretty, and usable is a house of pain. Doing that across platforms is a journey into the lower circles of hell.

Electron is heavily subsidized by Google (and others) via Chromium. It's also a much more bloated user-unfriendly resource hog than Qt. But we use it because paying for quality software is unthinkable. Now off to Starbucks to buy another $12 coffee drink.