Pinning in development is equally necessary if you hope to bring sanity to your development team all using the same codebase. Not pinning may be great for a one person 'team' or modules where you control everything, but can be a major time sink when one person is seeing a bug in a patch version they have and another developer is not seeing the same bug because they are on a newer patch. Allowing developers to "clone" consistent versions of the codebase is as important as deploying consistent versions to production.