They DID have a choice. There was a communal nest box shelf at the same height as the roosts when the coop was new. They didn't choose that surface for sleeping. A low ranking hen might roost on the 2x4 making a rim on that shelf (so a 1.5" surface) after being discouraged from roosting with the others but never did a hen prefer the flat part (for anything except placing eggs).How do you know the chickens do not care? They will roost on whatever is in the coop because they have no choice.
So, while I think they have a preference for gripping with their feet, they undoubtedly are going to use what is available. In the grand scheme, their preference takes a backseat to the human caretakers' convenience. But I do think it's time for this myth that it's somehow important to their health to not use their grip & lock reflex to end. They evolved roosting in trees, they will be just fine on branches.
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