I knew this would be a fun thread!
I'm one of those nut jobs that like 50/50 myself.Some of us actually use are knives hard many times a day,and no opening mail,cutting threads and fruit which seems to be the main uses around here don't count,so my knife may need sharpening before the day is done,but my serrations keep me going.
This "not eoungh of either edge", makes me ask for what?? I have used combo edges for dressing deer,opening packages,cutting many ropes,hoses,belts,webbing,yard work,plastic edging,bags,rags,food,fish and fowl.So what is it you can't do with one?My favorite combo edge is my BM 710.This knife has about 2 1/2 inches of plain edge same as my sak,yet nobody says that the sak doesn't have enough plain edge???
Really we all buy what works FOR US. I went to all plain edge,and went back to combos.There was just to many times my plain edge wouldn't cut it,to many times it just went dull when the serrations kept going.Yes I can sharpen thank you.I have also taken new combo edges and went at it in the garage,rope,plastic cardboard,wood,rubber etc.
Take a rope and a new combo edge knife loop the rope over the plain edge and pull,repeat with serrated part,I have yet to find a nib knife where the plain edge cuts as easy as the serrated.
As I write this I have a Plain edge Jim Burke folder and a plain edge Merlin in my pockets

.But if I leave the house I always make sure I have some serrations and there a must for me on the job.If I ever have to cut myself or some one free or out of something give me serrations for sure.