Your claim that because one accepts GPL (and friends) for software, one therefore likes FDL for documentation; is concise but dubious.
I did not claim this.
Unless hosted projects are not required to use FDL for documentation you must acknowledge that MJ Ray's warning is not FUD
It is FUD since it is a "warning", when there is no reason to "warn" about this.
FYI, Hosted projects can dual license documentation under another license, like the GPL if they want to.