An analogy:
My Swiss Army knife has a screwdriver on it. It’s nice to have, and I even used it recently.
It juts out perpendicular to the middle of the knife’s body though, making a literal " |- " shape, so for many applications it’s too awkward for the job.
I also have a more traditional screwdriver. As and when I come to build a new PC, I don’t think I’ll be using the one on the knife.
You joke, but I wouldn’t be surprised if that’s at the back of some people’s minds.
There’s also the whole association with Red Hat, and since Red Hat got bought, went corporate and murdered CentOS, Fedora is tainted somehow.
These things aren’t necessarily good reasons to not recommend Fedora, (for those see other comments) but they’re reasons nonetheless.