Apple already had it's own standard in place before Miracast was created. The audio only version of AirPlay (AirTunes) goes back a decade before Miracast, and

Apple already had it's own standard in place before Miracast was created. The audio only version of AirPlay (AirTunes) goes back a decade before Miracast, and the version that also supports video predates Miracast by two years. It would be nice to be able to add an iOS plugin to add system wide support for Miracast instead of just having some apps choose to support it.