Not really weird anymore I think. As Albert said DRM cancellation fckd things up somewhat. Something has to take a hit to get the rest of it up and running in time.
But they were first with Twitch.tv I would expect them to have the ground work done, of course I have no idea how their software teams are working, but I wouldn't expect the DRM scheme to slow down stuff like this.
I didn't believe the rumors about the software problems, but maybe there was something true about them.
There is the chance that they may have underestimated the number of people that would stream, but seeing the ps4 with its limited eye adaption and then the xb1 where everyone can do it, they ordered more bandwidth