I can imagine any reasonably size truck, semi etc turning left may need to use the bike lane to avoid clipping the front of a vehicle in the lane coming through from the other way. That portion (the passenger side of the semi) of the road would be in a massive blind spot for the driver, so they'd probably be relying on bikes to have stopped according to the standard rules of the road.
Probably a pretty rare scenario, and easy enough for a cyclist to see and avoid, but rules are built around worst case scenarios, not most frequent scenarios.
They’ll use any excuse they can to cut federal funding to blue states, to force them to adhere to new rules and regulations. Not sure how insulated they really are.