[danielsju6]

2 man years is nothing at Google scale.

You're asking that every engineer at Google spend more time writing better tests? What's the math end up saying there? That if each engineer spend more than X minutes per year writing better tests, there would be an ROI. Where X ends up being a comically low number.

And you'd still probably want caching system at scale anyway, esp. given a monorepo. Think compute hours saved.

NIHS, as you're calling this, can often make sense at scale.