The problem with that is people would still do the same stupid shit behind the pace cars which would just cause the same issues.
The only way traffic pace cars would work is with better fundamental training (and enforcement of that training [meaning cops would actually have to regularly ticket people for tailgating]).
Especially here in the usa there are hardly any barriers to getting/keeping your license.
There is a massive amount of drivers who either shouldn’t be on the road at all or with heavy restrictions like not allowed to drive at night, not allowed on the highway, not allowed to drive certain classes of cars (kinda like other countries do for motorcycles because there is zero reason for any joe schmoe to just be able to legally get behind the wheel of something like a supercar on public roads)
When idiots ride my ass I slow down.
Im driving the speed limit in the right hand lane and you ride my ass - I let off the gas to the minimum speed (here its usually 45mph)
Im actively passing in the left lane and you ride my ass I let off the gas.
When the idots back off I speed back up. If they start riding me again I slow back down. After a few times of this they usually pull their heads out of their asses and back off/ properly change lanes.