it's that there's no mouse and keyboard or printing support (as far as I know)
You... don't know. Here's a list of a couple hundred printers that work with the iPad, here is a roundup of keyboard/case solutions for the iPad from The Verge. I'm not going to search for mouse setups for a multi-touch device for various reasons.
You know what really bugs me about your post? Since the first time I logged into slashdot, I've been reading about cases of FUD working against Linux and Open Source Software. Now I'm seeing Linux and Android fanboys with their heads up their asses, spreading the same kind of FUD. "Oh, as far as I know, it doesn't work with external keyboards." sure brings me back to the times of, "It seems to me that if it was good, they'd charge money for it."
It's kinda sad that Apple hates on Linux then actually released a product that's less functional, less flexible, and less compatible with other software than Linux.
Apple hates on Linux? Linux isn't even on Apple's radar. What they've made is a product that's more functional and flexible than a phone, while being considerably more portable than a laptop. They weren't trying to create a new laptop, they were aiming for a product between laptops and phones. Most people have extremely low demands of their computers. Email, Skype, a browser and a photo editing application. Hell, my girlfriend is technical enough to fix her own router, but I haven't seen her do anything on her laptop that she couldn't do on a tablet in the four months we've been living together.