It's important for developers to frequently refresh their development environments from code in the source code repository. To do this, you need to be able to start with a clean development environment and in one step (or as few steps as possible), load all the latest code needed for development. Every extra step in this loading process will slow down the development. You also want to make sure that you can load not only the latest version but any version from the source code repository. You don't want the system to prompt you for the proper prerequisite to use or for it to make an arbitrary choice. You should be able to easily reproduce a development environment that you had several months ago or even several years ago complete with all the versions of the prerequisite packages that were available at that time. If you can't do that, you'll have problems when you're trying to support a released product and you can't even tell what versions of the code were released.
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