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Not a dissenting opinion but I'd love to see some case studies on rewrites. As a consultant this is a frequent request and will probably be big business in the future as people migrate off of expensive legacy mainframe or other applications from the 80's, 90's, and possibly 2000's.

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It's not "rewrite" that's bad, it's thinking you can cut over to a new system in a "big bang".

Rewrites are definitely common and beneficial, but the successful ones always run the new code and the old code side-by-side for an extended period of time. Which means you're still tending and caring about the old code, even as you strive to direct most of your effort into the new code.

There's the Sivers CD baby to rails (fail) and back to PHP (success) case https://sivers.org/rails2php

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