The code by itself doesn't tell you how the various components of a complex distributed system interact in a failure condition with clients hammering retries.

I mean it sort of does if you know the whole system inside and out and have the ability to reason about it, but just having the code for each component doesn't by itself solve the real problem of understanding

> these guys have the code!

But maybe don't understand it because they didn't write it themselves?

Not exactly confidence inspiring.