It doesn't destroy value, it means your team over-scoped the deliverable value at the outset. Shipping dates are good when used correctly.

1. We have this high level idea, we want to ship it by XXXX

2. Here are the features we want it to have that we think can get done by XXXX

3. Here are the features prioritized from mandatory to nice-to-have

4. Move the bottom 10% of features to v2.5

5. Move the next 10%-20% of features to v2.0 to make room for bug fixes, acts of god and management led boondoggles

6. Start development.