If you have ever tried printing from your iPhone or iPad to your home printer, you know how it's not straightforward. You need to use a supported printer, like a newer HP model with ePrint, or you need a specific app (usually free) from your printer vendor, such as Epson. That might be acceptable for home users, but imagine an enterprise with dozens or hundreds of iOS users printing to dozens of industrial strength printers. You can't easily replace all of those printers, financially or functionally, and you can't necessarily force all of those employees to download and use printer-specific apps for each printer.
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