Based on the office hour earlier this week, I spent some time performing scans of the PowerTools repo to see what packages from BaseOS, AppStream, and EPEL rely on it.
The results of these scans can be found in a repo here: https://gitlab.com/omenos/crb-depends
I was only able to do x86 based scans, and there will be some dupes of packages because i686 and x86_64 versions exist. Unfortunately this is a pretty basic check; I didn't differentiate between package types during cleanup, so there will be a lot of -devel packages showing up.
Hopefully the data is accurate, I did this fairly late at night :)