Are you serious?
BTW: You can use Google Cloud Print on iOS as well, which is compatible with every printer connected to your PC.
Yes I am serious. If I intend to use my iPad Air for productivity or even my phone, why do I need to setup a third party app on a PC or Mac that I need to keep running to be able to wirelessly print? I thought the whole point of the iPad and the iPhone is to make life easier. How is this easier if I have to engage such methods?
I recently bought a Nexus 9. I can now print wirelessly at home and at work at the press of a button. It's no iPad, but printing off emails and attachments is quite simple and easy. It just works.
Not everyone is purchasing one of the few and limited AirPrint compatible printers these days.
It's 2015. Wirelessly printing should not be a hassle on iOS. It should "just work".