Has everyone forgotten that the iPhone didn't support copy-paste, at first?
Edit: [completing my thought]
Apple was ridiculed for it, though; however, it's more evidence that the phone isn't 100% complete, and that Microsoft wants a tool out there to show the world what they've made. Perhaps then, as requests are made concerning the phone, they'll incorporate those, not to mention adding features they, themselves want. (It won't take long to want copy-paste).
As a second thought I had while extending this post. Startups are encouraged to release early and release often. Releasing early, I imagine, comes with "releasing a not 100% complete and not even completely polished" subtext to it), why are large corporations slammed for it? I thought we praise companies like Google because they similar to a startup, and yet we scoff at companies like Microsoft when they may very well be doing something similar. Admittedly, I've not followed Windows Phone 7 very closely, as I'm pleased with my current smart phone (Droid original), so perhaps they've not alluded to this being the end-all, be-all for their phone. Given how XP came to be, though, we really should be prepared for their original version to not be perfect, and it take a few (free) updates to get it up to something very good.
So long as I'm rambling, I should add that, if carriers start modding the heck out of the operating system to the point that a user can't download the patches that Microsoft comes out with, producing an incomplete product is a very, very bad idea for them (or maybe for the carriers) -- but I don't want to start the carriers versus phone-makers versus software-developers war, again.
End my two cents on things related to the subject.
[edit 2: some grammar-o's fixed]