> You can build software fast, but the more time you take the more you can be confident about it being correct.

> ...

> But it (right now) does nothing for the confidence about being correct - you still have to put in the extra time to ensure the software is correct to your desired degree of confidence.

You're partially correct - what gives confidence is duration in the field. No matter how long you take to build something, seeing it work in the field for 3 months gives me more confidence.

You have to release, early and often.