But sure it’s “perfectly safe” and even occasionally legal. Frankly the number of people defending this practice is a significant sign it’s a real problem.

And filtering to get in front in the intersection is safer for a cyclist, as one is then better seen. So no reason not to filter through stopped traffic, really. If it's a safety issue, the solution is probably to remove those making it dangerous (cars) from the streets.

The solution is to simply avoid trying to share a lane while sitting in people’s blind spots. Someone can easily get between two rows of cars turning left without realizing it and get knocked over even when the cars are doing everything correctly.

The same is true of sharing lanes even on city streets, lanes simply are not wide enough to safely share as the motorcycle or cyclist has vastly reduced visibility and may miss construction lane markings etc that unexpectedly move traffic.