I don't know about elsewhere but we check hats and bats before games, even before the new regulations.
For those that do not think it is their job, Please read 10-2-3.a
Rich that's the difference between Internet Umpires and Umpires.
Someone who thinks managers/coaches are rats are not approachable umpires and want to do as little as necessary, get their check and go home.
They want the power and authority but not the responsibility.
We have been checking the bats and helmets for years, but to check the bats against the list of approved ones would take forever. Let the coaches state at the plate meeting that all their bats are legal. Then, if there is a problem, they must prove the bat is legal or out it goes.