I think that there is an expectation that the release should be bug free. There were many who were complaining about the bugs shipped with D6 (myself included), and Boonex took a lot of flak as a result of this. I think that Boonex are now ensuring that the same problems do not happen again with D7

I was originally holding off on further development of my own site waiting for D7, but for the past month have continued, realising that D7 is still going to be some time away.