We are trying to make it difficult to *support* RHEL, not to develop Linux kernel. And BTW, I have just checked (that's regarding concerns about making life difficult for Debian & other free distros development). In folder with unpacked src.rpm for Fedora Rawhide kernel:
bradford:kernel $ ls *.patch *.diff |wc -l
All this is just about the RHEL kernel, not the Fedora one, IIUC.