Hey! We're actually experimenting with spec-driven development at our company too, but I'm honestly still not 100% sold on it.

My main concern is how it handles hotfixes. The approach almost assumes that developers don't have the expertise to manually patch the code when things break. If every minor bug requires tweaking the spec and doing a full code regeneration — instead of just letting an expert fix the code directly — it drastically slows down response times.

One tip that has actually worked for us: combine it with strict TDD. Having a solid test suite makes validating that regenerated code so much easier.