I'd rather have a chisel with a belly to remove things like dowel nubs, etc, anyway, and the issue of diving that charlie mentioned is a real problem, though less so in "real" paring chisels that flex (no clue why).
I flatten the backs of my chisels and double bevel carving tools (which I'm sure that I do less of than Charlie -carving - but carving will definitely make your paring better, even if you're a bad carver).
As a point of interest, there are some japanese makers who intentionally belly their chisels so that you sharpen only the last fraction of an inch, and the rest stays out of contact with the cut. I had a set like that years ago. It bothered me at first because I was a beginner and didn't understand, but it actually gives you more control in the cut rather than less.
I flatten the chisels now only because it's easy and i have the means to do it quickly. But I don't go to a mirror polish 3 inches up the chisel before I use the chisel itself, that's a complete waste of time, and the mirror polish just gives the chisel grip on whatever it's against, anyway.
I flatten the backs of my chisels and double bevel carving tools (which I'm sure that I do less of than Charlie -carving - but carving will definitely make your paring better, even if you're a bad carver).
As a point of interest, there are some japanese makers who intentionally belly their chisels so that you sharpen only the last fraction of an inch, and the rest stays out of contact with the cut. I had a set like that years ago. It bothered me at first because I was a beginner and didn't understand, but it actually gives you more control in the cut rather than less.
I flatten the chisels now only because it's easy and i have the means to do it quickly. But I don't go to a mirror polish 3 inches up the chisel before I use the chisel itself, that's a complete waste of time, and the mirror polish just gives the chisel grip on whatever it's against, anyway.