He can't just say "I conform to the mandatory requirements of NIP 771." because that might be a completely different document covering a completely different topic... tomorrow.
And he can't plan the implementation of NIP 14, 15, and 231 because those NIPs might
- disappear,
- be rearranged,
- be sliced and diced and
- have their content spread out to other NIPs, or
- be completely rewritten,
by the time he gets around to implementing them.
Even if it's only a matter of weeks.