I don’t fully understand it is easier for many LessWrongers to reinvent their own version
Well, the best way to understand something is often to (re)derive it. And the best way to make sure you have actually understood it is to explain it to somebody. Reproducing research is also a good idea. This process also avoids or uncovers errors in the original research. Sure, the risk is that your new explanation is less understandable than the official one, but that seems more like a feature than a bug to me: It might be more understandable to some people. Diversity of explanations.
Well, the best way to understand something is often to (re)derive it. And the best way to make sure you have actually understood it is to explain it to somebody. Reproducing research is also a good idea. This process also avoids or uncovers errors in the original research. Sure, the risk is that your new explanation is less understandable than the official one, but that seems more like a feature than a bug to me: It might be more understandable to some people. Diversity of explanations.