[Arainach]

It's not running "most of Windows". In particular, as far as I know (no insider knowledge), it's not running any of the Win32 APIs (USER, etc.). So that rules out any printers which require coordination with their desktop app (which, to be honest, to get full functionality is still a shockingly high number of them). It's highly unlikely the XBox hypervisor implements any of the printing APIs, even UWP because this is a video game console, and not only does almost no one own a networked printer, an even smaller group of essentially no one has a printer, opens documents on their video game console, and wants to print them.

Features aren't free. What Xbox feature would you drop to have an engineer go implement printing APIs on them? Is that the best use of their time?