This could be useful for undergrads getting their feet wet with LaTeX and the world of publishing. However, I'm very skeptical that the options are broad enough to conform to the exacting style guidelines typical of PhD theses. Usually people use a template from their school which already formats everything, autogenerates the table of contents, etc.

In fact it isn't clear what this system offers over a LaTeX document started from a template and hosted privately on GitHub. The CI pipeline can even be set up to compile the document for the people who want to be able to do everything in a web browser.