You are absolutely right... I've seen it turn a very motivated female grizzly from about a meter away...She shot the pepper spray from way too far away. I do not think any aerosol contacted bear at all, there was no "spraying him in the face". Pepper spray, like any tool, needs to be used properly. Had she advanced on bear and given him a good face-full her kayak would likely not have been disturbed. Senior Urso would have reacted like "Black bears matter" and high-tailed it out of there.
This is a true story.
A bunch of us were watching this video this morning, and we decided if we came on that scene, we would shoot the offensive pest
and let the bear go.