This question is wired to the topic: When to add another answer instead of updating my current one? - but is slightly different. Here is the story:

Few days ago I've created an answer, that provides complete working solution, to the question: How to Change the display scaling on the fly? There was posted also an answer, that was accepted. I liked the idea. The suggested approach looks really light and I already tested it. It works nice, but the answer is in low quality.

So, I want to write a comprehensive answer, but I can't make a decision about the inner question: Should the lazy author of the accepted answer earn benefits of my effort or should I create a separate answer?

What should be the principal decision model within cases as this one?