About 30 years ago, when my already old Bob Jackson needed a respray, I decided to have canti bosses fitted to suit 700c wheels, as I thought the old single pivot calipers I'd been using with the 27" wheels the frame was originally designed for might not reach the smaller rims. That frame has since had at least 2 sets of cantis, V-brakes (with different brake levers), and is now due another repaint. I feel so lucky to have been told that, since it has canti bosses, I can't possibly use any other sort of brake on it, certainly not the deep drop dual pivot nutted calipers I had in mind.
Mmmmmm, tell you what, I might just go ahead and fit them anyway. (Calipers, that is).
I'll wear my "knobber" badge with pride.
I've never yet put another poster on ignore, and I'm not about to start, but I've had to think long and hard about it.