The USA, Jamaica, and possibly a few other countries, are NOT the models for relay prep in any way.
Complain all you want but the athletes need to make a living first and formost and they are not paid by the federation, but rather by their individual events.
If they were sponsored then it might be possible to make more demands but they aren’t and relay obligations cost them money.
For example, if the USA commits a top relay team by name to Zurich, Brussels, etc, do you really imagine that the relay members would have much negotiating power left for their individual events? Who would agree to that unless individual negotiations were concluded first?
Those of you who’ve never made a mistake (cause you’ve never been there to make one) might consider what happened to the well rehearsed German team.
When confronted by the best teams moving off their marks while the 3rd man waited, he was drawn off early, which is death to any relay team, whether you pass over-hand, underhand, or up your ass!!