I am the creator of Phenomic and I am actively working on it. If anyone have a question, feel free to reach our community on the public chat https://gitter.im/MoOx/phenomic ;)

The problem of Gatsby in its current form is that this generator doesn't scale at all. It embed all content in your javascript bundle. Which is ok for just a couple of pages. Another similar react/webpack based generator exists (linked below, https://phenomic.io/ ) and explain well the different between itself and Gatsby in its FAQ https://phenomic.io/docs/faq/gatsby/ .

The problem with this approach is that it's too error prone. For example using a JavaScript based engine, with template in JS/JSX is easy to lint using eslint and flow in order to prevent a lot of errors. We are humans, we do errors. Let's automate the pain :)