In my opinion - and I am a pre-orderer from the very first day - this is one of the downsides to having so many people paid up in full. It entirely removes the dire necessity of having a product out at a certain time, or face certain financial ruin.
You see, Jack wants to create a perfect product... the ultimate pinball... and his team is attempting to do so, no matter what major issues are thrown in their path - and there have been plenty.
However, it's because they're financially secure that they can afford to take their time and let the months slip by. I'm not saying I would rather have a rushed product - I do want this done right. But as a perfectionist myself, I know that perfection is an unobtainable goal that you can spend an inordinate amount of time striving to reach. But on the other hand, people up against a hard time and money crunch can be rather innovative in finding solutions while still managing to maintain quality.