Meaningful grit is always useful. I wouldn't want a roster full of these guys, but there needs to be some balance. It's not a coincidence that Tampa finally got over the hump when they started to acknowledge that these players matter.
I won't compare him to Fast as a player as JF is MUCH more impactful across the rink, but in the offensive zone in the corners/along the walls, Bennett is better. Could definitely see a situation where he would really fit in well on Panarin's opposite wing. I don't know if its so much a grass is greener thing as it is a we don't have anyone who can play along the walls outside of a few of our 4th liners, Kakko kind of, and Kreider when he isn't sucking.