I was of the same mentality, until yesterday when I watched this PyCon video, uploaded 13 May 2018.
https://www.youtube.com/watch?v=GBQAKldqgZs
To cut a long story short, if you're happy with virtualenv and pip then that's great, but the idea of pipenv is to replace virtualenv and pip, which means you'll actually have one tool fewer. :)
