Electron comes with an enormous, deep, absolutely stupid big pool of web developers. I genuinely can’t emphasize enough how big it is, and how easy it is to hire from.
Montevideo, Montenegro, Monterrey, doesn’t matter. Hot, not particularly expensive developers are ready to churn out React UIs in your area!
Looks at the web.
As Linus Torvalds put it, it's worth writing the whole thing in C for no other reason than to prevent those 'developers' from 'contributing' to it.
Or better yet, make a web engine from scratch, that is, write the rendering engine, compositing engine and so on using Electron primitives.
Because both of these work very well when using Qt as a base, see LXQt and KHTML.
JS can get close to C++ in speed but the same program in JS will always need more memory.