FWIW, these boilerplates are enormously useful for reference and gaining knowledge of how HTML5 works, but rewriting and expanding our personal boilerplates is what we do as front-end devs. We never had a standardized boilerplate for HTML 4, after all.
Personally, I take bits and pieces of knowledge and techniques from these boilerplates, roll them into my own base template, and build on them with each project.