I appreciate that you consider these all to be big advantages, but as a user they fall somewhere between "doesn't matter" and "makes the product worse". The only benefit to your users is the faster time to market, and that's debatable.

As a user, I want an application that performs well (which Electron apps typically don't, my main issue with Atom and Slack), and I want an app that fits in well with my platform, which an app designed to be the same on all platforms just isn't good at.