But that's the point! If the road was bicycles only, the traffic planning would be entirely different, most likely either no traffic light at all, or a small roundabout.

Traffic signals only exist to accelerate car traffic. They slow down everyone else.

The most dangerous thing you can do as bicyclist is stopping, because the first ~10 meters after you’ve just started cycling again your balance won’t be perfect yet. And it happens that these few meters are almost always right in an intersection, in a conflict zone with cars.