I hiked that without a thought of bears. Not because bears don't worry me but because it didn't dawn on me that they would be in that area. It should have because the Canadian Rockies are replete with grizzlies.
My thinking on Yellowstone is similar to my thinking on the Great Smoky Mountains NP. So many tourists go there that the bears are familiar with humans. And that familiarity just seems like a recipe for problems. I don't think the typical bear behavior comes into play. I'm not sure a good understanding of bears will do you a lot of good when he bear isn't behaving typically. I wouldn't hike Yellowstone. And honestly, I'm not keen on hiking the Smokies either.