A.G.,
I collect one series of knives. I 'USE' several types. I have had slipjoints close or partially close the blade on a few occasions none causing injury. I have stuck my hand inside a elk to cut stuff loose with a stockman, but prefer a small lock. I also hunt with a SAK with a saw and lock blade, which I am pleased with. But, you always have the option to size the knives to job, and carry larger locks or go to fixed blades.
I have a fondness for a old TL-29 which many times I have wondered why was the lock not on the blade instead of on the screwdriver. I am guessing it is for the wire stripping use of the screwdriver blade.
Once in a great while I will have a open blade move, but for everyday-walking around activity as listed in most replies to the "What did you cut today" thread a slipjoint works as the family sedans of knives. In my case and it appears in their's, lockbacks are the heavy haulers.
All that said, if you come up with trim and compact lockbacks the size of average stockmen,trappers,barlows and canoes, I would be interested.
300Bucks