Paul,
In the field I use a sharpening board and the modified grind is a lot easier on the board than the convex, also, as I said I tweek kit for my intended use, yes the convex is a superbly robust, but for woodcraft, skinning, shaving feathers, carving trap triggers,etc the modified grind is better. I don't have to punch my way thru many aircraft hulls.
When I say easier to sharpen, I mean with cold, numb, wet hands, when your tired (when accidents happen), to lay it on the board on an easy angle and produce a razor edge in a few strokes makes a lot more sense.
With 25 years as a chef under my belt, I use knives a lot, and you get used to re-touching the edge on a blade a lot. As a survivalist I'm used to putting blades thru their paces, multi-tools, folders, etc, and have tried most on the market (and over 25 years thats quite a few) and the F1 beats virtually everything else out there.
I have had an F1 for about the last eight years, my original was sold on and I have a blade blank with a custom handle now, still a superb knife.
My one fault (which is purely personal) is that it is too heavy to carry round your neck for extended periods, but that is the only fault.
As I said all my kit is modified (ask anyone who as met me), my boots are my design, my smock-bergen-hammock-stove are all home-made, this is my life not my hobby and so my kit developes as my life changes.
Recently my knife changed too, working for Bisonbushcraft I was given a "one-off" by Roger, a scandi-grind in 01 tool steel and changed slightly to meet my requirements. This to me, is the ideal bushcrafter and has been my companion on all my course/adventures thru the year.
If you don't want to pay out for a custom kife, but do want a very good bushcraft knife, get an F1 and customize it, change the grind, the handle, the sheath, personalize it. Look at what your REAL uses for it are, and shape it in that way.
I hope this answers your question.
N