As far as Baker, my brother and I hiked onto the Arm for years in the late 70s and 80s. At the time we didn't know squat about snowpack, had no transceivers, and our basis for determining avy conditions was that we could or couldn't see naturally triggered slides. Pretty sketch, thinking about it now. This was well before their BC policy. But, more importantly, it was also well before that big slide. I'd wager that anyone that saw the size of that crown hanging on the hill for the months after the slide is pretty well convinced now that the Baker BC policy, and taking that level of precaution, is a good thing, given that the alternative really is outright closure (they can't control any of it, it's wilderness). What I like about the Baker BC policy is that it is somewhat self policing too. If you see someone on the hike that is solo, isn't beeping, no shovel, etc., there seems to be a general community vibe that it is your right/duty to call them on it.
I'd agree w EternalX that there are just as many yabos out by Herman Saddle, beyond Artist Point on the snowshoe trench, etc etc.