python-setuptools explicit build dependency

In spec files of Python based software, python-setuptools is a build requirement that is mandatory for EPEL7, on Fedora instead it is not required because it should already be a runtime dependency for python-devel. By the way I remember I have heard that in next future it should be added explicitly for various reasons. Since I am actually doing some edits on the spec files of all Python packages I mantain, I would like to know if what I have heard is true, so that I can add it such dependency now. Thank you