well the problem is that this platform is pretty new, barely 6 months since n900 was released, android has been released for over a year and iphone for a few years. Native Office editing app will come dont worry, and when it does it'll be better than both android and iphone. in the meantime open office is perfect can handle documents fine.

also dont forget .doc is microsofts own format, they dont hand out the specifications to their formats to anyone, thus its even more difficult to create a .doc editor!