That type of logic is why I prefer roads to bike trails.
Motorcycles need the full width of a road, so do bicycles. When engineers lower the specs for bicycles, they are thinking of a child riding 5 kph on a Sunday rec ride, but we need roads designed for cargo bikes hauling a weeks worth of groceries or rebar and cement down hill at 40 kph.
When you make the lanes smaller or don’t clean the land of debris or permit sharper turns, you endanger the lives of cyclists. That’s not OK. Cyclists are vehicles and our roads should meet the same specs as all roads.