Teaching for Mastery (≠ teaching for synchronicity)

Imagine hearing this dialogue:
Project manager - "Eehh, time is up. All the other houses that started with us are moving on..."
Construction manager - "But sir, it rained for 3 weeks straight here... the concrete is still wet, we're not even up to code..."
Project manager - "You have 2 more days to reach 70% completion of the ground floor... do what you can, and move on."
Would you build your house on top of an unfinished foundation?
Of course not.
- Sal Khan, TED: Let's teach for mastery