> Using your horn as feedback means you missed the moment.

Perhaps. I try my best, and think I avoid the vast majority of potential conflicts that come my way. But I can't avoid them all. I can prepare for the common problems, e.g., drivers turning into the bike lane without looking or doing a right turn on red that hits me or goes directly into my path. But those don't cover all possibilities, and I'm continually surprised by the diversity of bad driving that I've seen.