My biggest gripe with the conda depencency manager is that it doesn't keep track of which packages own which files, and if multiple packages own the same file the last one to be installed will happily scribble over whatever was there before. With hilarious results, of course.

This means that keeping a conda installation up to date is often very tricky, when upgrading you frequently have to uninstall and reinstall some packages.

It works better if you start from scratch with a requirements.yml file.