I can look at the javascript of many "big corporate" websites and see they are often a sprawling mess of homebrew code. I'm sorry your electricity company's React website is bad, but I don't think an anecdote is data. Any framework can get abused, not using a framework doesn't mitigate the problem. But trying to update a site that uses a different approach for every little feature spread across many pages, without any idea of what a component is, that's a nightmare. At least you can sensibly incrementally improve React across a site's components with well worn tools, especially as a team.

I don't love Microsoft, but it's for the best they adopt a well known and rounded framework like React, rather than try to invent yet another of their own frameworks, like the ones you mentioned. I don't know why this has anything to do with Electron, since their React push is for their front end frameworks for their main corporate product, Office365 (or whatever it's called today).