>It's not the question of "want", it's the question of "need".
Yes, but that was not the issue. The issue is whether FSF should provide C++ coding standards across all GNU projects. The alternative is to leave it up to the individual projects to decide. I am not at all sure it is a good idea to have FSF dictate C++ coding standards across GNU projects. I am pretty sure having RMS dictate such standards is a bad idea, so asking for that makes no sense to me.
Generally speaking, the developers of any GNU project can do pretty much as they please with the code if they are able to agree (except if it goes against freedom of course). As such, GNU projects are no different from other open projects. Get the other leading developers on your side, and you will get it your way.