I like Electron's features, but I don't like how it runs its own Chromium. I'd really like a small, local server launcher that just runs whatever default browser the user has selected, with a borderless window. No attempt at auto-integrations between client-view and server code, just let me do it like a regular SPA. Bonus points for letting me specify my own server executable, so I can do it in whatever language I want.

EDIT: seriously, it could run its own local server for privileged OS integrations, giving you an IPC API over REST.