Because that's one thing that always a problem with standards: we define them and if there is no platform that supports them developers can't try them out and can't give us feedback on where they get stuck, so in this case we have a way of actually getting these proposals but also seeing them directly on the device which makes it about much better story for developers to try them out because developers who are not too kind on trying out new things because they think they would lose clients that way have a chance to just put an IF statement around it and test it on one device and don't have to worry about the other ones. 