They Also help with roof rigidity as well.

But if its a race only car,
You don't need to worry about the noise.
You don't need to worry about the rain getting in.
You don't need to worry about roof rigidity if you have a cage/bar.

So do what you like, but I don't think I would like the looks of it.

So as long as you don't race at any of my tracks, and not there to offend me with your drip rail less looks, then have at it if its easier.