UCI Just Bans Forearms On The Bars
 

Will it affect USAC?
For years from 1970s to something you could use a recumbant in a USAC TT. Just nobody did. Will USAC riders choose to not have forearms on the bars, or will a rule say they can't?

Then I think rules you can't enforce are rather useless and penalize the honest ones.

If social media can be used as evidence, enforcing shouldn't be all that difficult. Anyone riding their forearms and thinking no one's looking of filming needs a reality check.

no way they can enforce at the local level in 2021

First thing that came to mind wasn't my pitiful Cat 4/5 racing. It was the folks who like to do Merckx TT's. Will a Merckx TT be bound by that rule? You're alone. It's a TT. Different rule set?

I posted this a few years ago. Juniors and collegiate do the Merckx. He and buddies have been doing the arm rest since age 10.
On the Collegiate ITT National Championship starting line (~2017) the chief referee (now the head director at USAC) says to my kid "I prefer you keep your hands on the bars". I asked him later about that and he said it was not a rule, just a preference. Personally, I don't like officials (I was a soccer one for years) giving any advice, coaching or otherwise, but USAC builds coaching into its rules all the time, so I was not surprised.

I expect they will put more rules on the juniors first where it doesn't matter and can't be enforced so by the time they are adults they will be skilled at doing things without being seen.

I hope not. That would be a game changer for those for me.