Two skinny J's
Older and wiser, I like thatthere is a lot to that... most young male road cyclist shave where I live and the over thirty group is much more mixed. Some do but most don't. To me this illustrates the pros do it affect. As people become more confident in ourselves one just does what works best for them and forgets the whole what is cool or pro stuff. Basically older and wiser.
Not saying it is dumb or immature to shave. Just why more young riders will do it than older riders do.
On a side note in the bike shop even if they have a mtb with them, I think... legs shaved means roadie! On mtb rides it is easiest way to know who is a roadie. Or cross dresser haha kidding.
Last side note... if it makes one feel better and faster than it will have a positive affect. Confidence isso important. If you feel faster in a wool ballet skirt, then find one and ride in that.
Pretty sure if I was a guy I would not shave but am not bothered by guys who do. It is cool either way, as long as they ride.