> Historically, rewrites are a terrible idea.

This changed for me over the last 5 years.

The first scenario was joining a company where a software product barely worked. We did the traditional incremental refactoring / rewriting, but eventually learned how rotten the core was that rewriting from first principles was the best path forward.

The lesson learned here is that the conventional wisdom probably only applies to rewriting complex but working systems.

Then multiple scenarios in the agentic coding age. Between day jobs and hobbies I've reproduced major chunks of complicated software like Salesforce, Gmail, Pioneer Rekordbox with very lean teams.

Much like the blog post, the trick is to get an excellent verification loop with a compiler, linter, and test harness / test suite around the core behaviors.

It's feeling more and more that designing and implementing comprehensive test harnesses is the real work, once you have that let the LLM cook.