I'd love to hear a comparison to features provided by pip-tools. Managing the pyenv is nice, but not at the expense of giving up the ability to auto-update and remove stale dependencies from a requirements.txt file. Is this something pipenv can handle at this point?

Someone created a very relevant issue, and I would suggest taking the time needed to close this before doing any more publicity. https://github.com/pypa/pipenv/issues/1398