This means that new-hires are handed a cryptic and seriously out-of-date document with instructions on how to setup a proper VM environment.
They check out their code.
They deploy...but wait the deploy fails because of missing data, missing document types, missing lists...
Open up SharePoint, enable some doc types not turned on by default, turn on some more features, add a list. Deploy again, no wait it died again, oh now it's a different doc type and a different feature that the deployment doesn't turn on by default ...etc
The end result is a mess that requires days to get up and running, not hours.