That's fair; although I'm pretty sure they wouldn't be able to have such a consistent and unique look-and-feel with React Native (you can correct me if I'm wrong). It's debatable whether that's a good tradeoff, but it's totally one that some people would make.
well, consistent with what? If you mean the native Mac/Windows/Linux desktop experience, yes, it's definitely impractical to do that with any size budget. But the current Electron app isn't either. But if you want consistency with the web app, I don't see anything difficult about that.
I do wonder if the plugin/extensibility architecture — "Slack Apps" like Github and IMGUR and OpenTable — is the real answer. (Unless I'm mistake and these run on the native mobile apps.)
Consistent across OSes; I haven't really done native desktop dev but it's my impression that the elements you're given can't be customized to nearly the same degree that they can on the web, via CSS.
