Pipenv is very controversial project who lost its reputation. Many times I have issues that was making my everyday life very uncomfortable. And of course I saw issues on GitHub with other people who also have the same problems. And then in the middle of the very constructive conversation somebody from the maintainers team or initial creator of the project jumping to the thread and very aggressively close it or saying something like "go f--k yourself we don't need it". Srsly? Who will like this level of the conversation? It is ok if you don't have resources or time or whatever, but we have this particular problem. Don't be rude and push people against you.

My personal opinion that some day ripples on the water made whole loop.

And last but not least: pip+requrements.txt are not the best, but pipenv doesn't add much over it. It gives you a little but introduce another level of abstraction over the same things with its own level of complexity.