Last time I tried building a 'blank' node-webkit app for OS X (using https://github.com/Dica-Developer/generator-node-webkit ), the resulting .app came to ~100MB. Does anyone know the base size for an atom-shell app?
The alternative is not making apps self-contained, but instead to make them rely on shared libraries. This is much more efficient, but apart from a few neckbeards who cry "bloat" it seems that most people care more about avoiding dependency hell and ease of use, even if that means large packages due to library duplication.