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Increasingly convinced that specs are now the source and that code is an artifact akin to a lockfile.

Isolating a program from complex systems for testing is a lot of effort. Often solved with dependency injection of mocks, or exterior composition (to mocks). Mocks can drift and DI introduces codepath complexity. So: Build mock env from specs

Distributing software libraries for multiple languages is extremely costly for a software company (such as bluesky). Quality drifts between languages, maintenance burden is huge. So: Build _ API in our teams' lang from specs

This one might be too extravagant so we'll see, but... Writing software for each platform (native ios, native android, web, etc) is extremely costly and requires middleware ecosystems like react native So: Build app for target platform from specs

This means there is no reason for anything you *didn't* explicitly specify to work the same way, and this will at some point bite you in the ass.