14 Kempo
Grandmaster
It might show how well you really know the form.
It might show you techniques that you did not see before
It might depend on which form and what style you are in to make any difference
Like I stated before, I'll agree to disagree. If it works for you, whoever you are, then I wholeheartedly say "Do it!"
For me, I use other methods to know my forms inside and out, but not backwards. Application of movement is number one in my book and that is where I concentrate my work. That's what works for me, and therefore that's what I do.
Know it, See it, Do it ... that's how I see forms.