To add some weight on 2 - with Electron, you rarely have to even think about platform differences, and just about everything you'll need to handle for a typical app (including installers, code signing, automatic updates, app linking, notifications, etc. et al) can be taken care of easily, either through core libraries or community libraries.
Electron isn't just Chrome in a box. It's a whole ecosystem of libraries that dramatically accelerate and simplify cross-platform desktop development.
Just because you can get another project running on all platforms, that doesn't mean the experience is going to be a smooth one. There are so many potential boondoggles lurking here. Do you really want to bet your company on something that uses less RAM or CPU but could easily confront you with problems like, hmmm, suddenly 43% of your Windows users can no longer update their apps and you have no clue why and the maintainers aren't responding on Github?
Electron has its faults, but if we want to build something better, we should also understand its strengths. Despite its performance drawbacks, it's an impressive technology that gets many important things right.
But two things make it extremely valuable:
1. Ability to render css and js, so that web devs can build our app
2. Easily cross platform. This is so valuable to us.