When is it good (if ever) to scrap production code and start over? [closed]

Answer 1

I think the rule was...

• The first version is always a throw away

So, if you learned your lesson(s), or his/her lessons, then you can go ahead and write it fresh now that you understand your problem domain better.

Not that there aren't parts that can/should be kept. Tested code is the most valuable code, so if it isn't deficient in any real way other than style, no reason to toss it all out.