I agree. The biggest cause of issues between cars and bikes has got to be speed differential, so if I'm on the appropriate bike i always ride in traffic. The bike lanes always get the worst sections of road (the curb) with cracks, drains and debris, Plus cars right hooking you, a car door biting you or a jaywalker on their cellphone are not infrequent risks.
That said there is a big biking population who should not be riding in traffic so without separated bike lanes can't get to parts of my city