The purpose is documenting information about a function makes it easier for people to edit or rewrite entirely than just knowing about one byte. Granted, the people who know how to use that information are few, but that doesn't mean it shouldn't be available. I'm not even saying it should be that instead of "change x to change y", which is what it sounds like you think I'm saying, but if you're going to make a topic about useful addresses in the game they should be to the whole function and interesting opcodes can be highlighted. A perfect example of this would be jjl2357's documentation which labels a whole bunch of functions and their purpose as well as parameters. Don't you know C# anyway? What did I say that was so confusing to you?
Anyways, my point is, if a topic is going to be devoted to useful addresses, it should have more context and comments.