I think the way MSFT went about this is better than iOS. Apple has ios on their phone and tablet but their tablet is limited to what it can do. For example on Windows RT
1. You can plug in usb drives, keyboards, mice, etc.
2. You can use windows explorer to browse files
3. It comes with Office 2013 installed. You can install office on a mac but not on ipad because ipad uses the dumb phone iOS...
4. The PRO model has full W8 and can join to corporate networks etc. and install full desktop apps.
5. You can bring up the charms menu and recent apps by swiping from the sides which works equally well using a mouse on a desktop PC. The phone wouldn't be as usable with the same feature.
I've always thought of iOS as a giant phone without the phone... But Windows 8 PRO \ RT on a tablet seems amazing and I'll be getting one soon.