In general I think, if there is a package which is part of RHEL, there is an engineer working on it and contributes patches and is well versed in the code of it. Otherwise if there is a bug reported by paying customer, they won't be able to fix it. Opening a bug against any of supported Red Hat products by paying customers have consequences and it isn't like a bug on gnome or kde that goes unanswered/unresolved for years.

But RHEL by default doesn't have as many packages as Debian or even Fedora. See recent announcement about LibreOffice. Red hat can't by default ship a package that it can't fix and support.