There are plenty of control panels that work with Debian-based OSes and abstracted ones like Webmin, so I don't see much need for CWP devs to spread themselves even thinner by trying to support another distribution lineage. In this case, specialty is good. This was originally CentOS Web Panel, now rebranded as Control Web Panel to keep the acronym but apply more generally and not be specifically limited to CentOS proper (which now has taken an upstream swim to be an unstable rolling distribution). Personally, I prefer Debian OS derivatives on the desktop (Ubuntu, Mint) and prefer EL on the server side (CentOS 7, soon to be Alma Linux 9).