Agreed, but no one ever uses that stat. Imo, I would replace the bp stats with games saved with bp against or something similar. For instance, Federer 4/6 means that his opponents had bp(s) in 6 games, but only broke twice.
I put the emphasis on number of games in which break points were saved manufacturing stats of matches. I've just opened a new thread
in which I'll be gradually adding finals of majors (and other interesting matches), and there will always be included info about the number of games, in parenthesis; but I agree that my way of description, for instance 4/12 (6) might be depicted in your way, thus 4/6.