Except for an Opinel number 8 that I rarely carry, I haven't even owned a locking blade knife in decades. Through the 1970's and 80's, my real world EDC was a Buck 301 stockman, backed up with a SAK.. Then in the late 80's, I carried a Buck 303 stockman, backed. up with a SAK. . Then in the 1990's for about 10 years, my EDC was a Case peanut, backed up with a SAK. On and off I fooled around with Opinels, modding them, and giving away a lot of them to non knife people. Theres one Opinel left and that may be going too.
There was a very very brief time in the 1960's that I carried a Buck 110 in the ubiquitous black pouch on the belt. At the time I was still in the army engineers, and they sold the Buck at the PX for a ridiculous low price. But after a few months of carrying a heavy knife that outweighed my Wenger SI, and had none of the mission capacity of it, I sold it to a young troopie just rotating in and good riddance.
If I need a knife that I know will absolute not fold up on me, I use the original non folding knife, a sheath knife. I don't like to call them fixed blades as there is nothing broken that needed fixing. I've used the heck out of the Buck 102 woodsman and a Martini puuko from Finland as my "fixed " blades. They also serve if I need a one hand knife. Somehow I've never in my 82 years of living, found it hard to open my slip joint pocket knives, even on a ladder.
The past decade has seem me using the humble SAK more and more as a daily EDC, and so far its been fine. I'm still alive, the sun is still rising in the east, and my dog still loves me. The past year, my Vic classic has been a steady daily carry, with a batam or cadet carried if I thought I was going to need a bigger blade to deal with food stuff like cutting a sandwich in half for my better half. Since August 24th, my sole carry has been the classic with my old Wenger SI in a belt pouch. I don't see any change in sight.