Software should do one thing, and do it well. Each piece of software should have a clearly-stated goal that is used to determine whether a particular feature should be implemented or not. When a proposed feature does not fit with the software’s stated goal then don’t implemented it. Just don’t.
Like adding source control to your product. We already have several perfectly good source control systems. Building your own custom source control system into your product is never a good idea. Your implementation is unlikely to be as good as the standalone products like Git, Mercurial or Subversion, and it’ll probably make it difficult for me to use my source control system of choice.
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