So, I was reading an old 'Woodworking' magazine, remember the one before they merged with Popular Woodworking (bad day)--they had no ads.
Christopher Schwartz was writing an article (I have several of his books, and enjoy reading his stuff), about proper handsawing. 2008.
In joinery, one of the premises is that you should always be able to see the line that your sawing next to. for a right handed person, this would mean that your saw would always be to the right of your line.
So how does that work for sawing dovetails, and other instances where the saw (half the time) would naturally be on the left side of the line? Do you make another line, and saw just to the right of it? I carefully read his text, and that is what he implies, cause he says you have to really master one saw that has a kerf that you're used to.....
If I emailed him, I'm sure he would explain. (He answered a few emails several years ago), but I am asking you all about this.