Electron is a very easy way to develop applications, and it's definitely doing something right. I've written Gtk (my preference) and Qt for ages, and developing stuff in Electron was mind-blowingly fast, trivial to debug, and trivial to produce packaged binaries for multiple platforms. It's very difficult to achieve a similar development experience with native toolkits, and I think we'll continue seeing more Electron apps until native toolkits offer a comparable development experience.