I have a similar or related question.
This is one part of the Filmic module I studied and really tried to learn. When I apply what I learned, I do see differences in the results, but the differences rarely seem to be improvements.
I know that I should start a new Play Raw with an example that just focuses on that aspect of processing, and what I see in the results. I will do this when I get the time.
PS: Here is the new thread Re: My question about Filmic highlight reconstruction