Interesting. I've been reading about this lately and it seems the agreement is under normal dry conditions, that groove design isn't significant.
I can see how roughing the face would add friction, but I'm not convinced that Roll-up is the complete answer.
I would think you don't have to have roll up per se, just 'grip' to transfer energy into spin. You might only be using one or two grooves on any given shot for that grip, but I'd have to say grooves matter!
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