Broad enumeration capabilities of this sort don't make sense. You don't need me to tell you why, because the moment you considered these features not existing, you immediately thought up alternatives that didn't involve running javascript, some of which require changes in the way people think about building web-pages, some of which may require changes in various specifications.

JS has more features than it deserves for learning about and (critically) sharing information about the host platform. Yes, you can still learn some things as a website operator by watching what browsers load/don't load, and what they put in their requests.

That does not mean that disabling javascript doesn't have value w/r to privacy concerns. Compare panopticlick.eff.org w/, w/o javascript enabled.

Edit: I should hasten to add that there are other concerns beyond privacy, like accessibility and the fact that a web page has no bloody business deciding that I'm likely running an iPad and therefor I shouldn't have access to X or Y. This is dumb, and contrary to the idea of the open internet. It's the same thing that's wrong with this EME nonsense.