I like the sharpening choils, I cannot stand the shoulder that builds up at the base of the blade without one. When sharpening that shoulder catches the corner of the stone, which in turn lifts the blade off the stone, causing a gap between the blade and the stone until it drops off the corner. This does two things, wears the corner of the stone, and the spot of the blade that is in contact with the stone at the front of the gap.
It never bothered me until I got a diamond stone with its sharp corner. Then I looked and all my natural stones and realized the corners were all rounded. A worn stone ruins a knife, and a knife with that shoulder can ruin a stone IMHO.
I use a cut off wheel in an angle grinder. Just barely kiss the blade. I try to angle it back slightly, which helps keep it from snagging fibers when cutting ropes.
I'm glad Buck doesn't put one on at the factory, that way the end user can add it the way they like it to be, or not add it at all.
I also find the small choil to be useful for stripping insulation from low voltage wire.
I wish I had watched the video Chris posted, before I wrote my post. It does a much better job explaining it than I did. Also has a very elegant solution IMHO. worth watching for sure. Thanks Chris.