[samstokes]

Maybe she shouldn't be allowed to, and should consider that 20 minute code as not existing. (Because on day 1 of her week, she could have written it properly.)

Completely agree with this, and I wish it was said more often.

Prototypes are a valuable tool for testing hypotheses, but you have to discard them when testing is no longer all you're doing.

That means the key to responsible use of prototypes is to make sure you remain able to discard them! This is why shipping the prototype is so dangerous - because now you're locked into either maintaining the prototype, or a rewrite followed by a tricky, risky live migration.