I have had excellent luck with Case knives. I've bought older ones, and some newer ones, and one 2020 half whittler. My three swayback jacks are of GEC quality. I have three trappers... two full size, and one mini. Excellent knives, all of them arriving pretty much almost shaving sharp. The only "questionable" one I've bought was a 6249W copperhead with a wharncliffe blade. The pull on the main blade is very light... perhaps a 2-2.5 It's a very pretty knife, blue bone with a slight gap at the backspring of the main blade. My new half whittler is excellent, as well.
I, however, do not expect "perfection" in a knife. Hairline gaps at the springs don't bother me.
I've also had great luck with the few Rough Ryders I've purchased.... knock on wood, I guess....
My GEC's have all been of excellent quality, with most of them arriving with very good edges... my worst one has been my new 33 conductor, but it sharpened up really nicely, and is a great knife.
Again, perhaps your expectations are higher than mine, and it is entirely possible you got the 3 or 4 real lemons that made it past a sleeping QC inspector.... I just haven't seen any of them.