I think Apple has deliberately removed the generic AirPrint proxy from OS X to prevent that lazy printer manufactures get away with just letting their users use the proxy. Now printer manufacturers are forced (hopefully) to add AirPrint support to their printers and users will be happy. Proxyless printing is the only viable way to achieve standalone iDevice usage. Else we'd be forever needing a powered-on PC or Mac in the network to be able to print from iOS.
Yeah more it says FU to the manufactures add they are not going to bother with it. Printers generally out live computers so this is forcing people to buy new printers which they are not going to do. Big time if they have a older Laser printer.
Apple system is nothing more than what I could call a fancy generic driver.