Dozens of comments and no mention of DIP yet. You should absolutely use dependencies, and your should be able to tear them out as soon as you don't like them a

Dozens of comments and no mention of DIP yet. You should absolutely use dependencies, and your should be able to tear them out as soon as you don't like them anymore. Including the dependency can even be part of your NIH if you're so inclined. Instantiate two copies of your code (dep/NIH) and test that they behave the same.