0. We need this done yesterday.

1. Moving targets. As the code becomes usable it becomes clear what is really needed doing and how it should be done. And it's certainly not what was defined at the start of the project.

2. So the prototype/PoC works, thank you! - "job done" - more than good enough. No time to go refactor for the many little "todos" in the code that say " this code needs to be revisited because ..." as the next project "needed yesterday" is already here...

Craftmanship is for academics and people that don't work in the real world because it needs time, lots of it.