One does not have to know the specifics to know the specifics.
Steve and Charles are walking a fine line between their desire for income (sales) and their commitment to quality, which relates to pride, reputation and yes, ultimately, more sales down the road as their company aquires something even more impoatant than a good product, namely a great reputation for good products.
I give them a lot of credit for having the stones to make sure this product right (by their definition) and to not introduce a date that could, by their own doing, introduce pressure on themselves to make bad business and creative decisions.