[adamb]

I forgot to mention that using the same build tool for both CI and developers has a number of other advantages, including artifact caching. When a developer downloads a change, their build will pull artifacts from the caches that build slaves have populated. So in many cases new changes (once deployed) are only built once, across the whole company by the build slave that kicks off the deploy. Everyone just reuses that cached output.

It was this sharing of artifacts that provided some of the impetus to use a sandbox, since a polluted output could poison the cache in hard to detect ways.