Since we're on "that" bus, I'll put my $0.02 in.
I bought a fixed blade once. It rattled around in the sheath when I shook it. Obviously, it was poor craftsmanship because when the knife was in its stowed position, the centering was off and the blade was loose.
Blade centering, unless actually contacting a bolster has absolutely zero impact on the function of the knife. It is merely a cosmetic criticism that gives the excessive compulsive folks something to complain about. It's mind boggling to me why some feel compelled to use blade centering as a measure of QC.
You say other companies don't have this problem? Please provide an example of a similarly mass produced folding knife that experiences fewer issues.
Now... edge grinding issues I'll agree with to some extent. I want my cutting edge to be the as close to center of the blade thickness as possible unless it's intended to be a chisel ground edge.
Blade can be moved in the stowed position? Again... tell me how it feels when the blade is open and locked. If it has play in that position, I'll concede there is a problem. If you want the blade absolutely fixed in the closed position, you're asking for a locking mechanism to hold it in place. I'm sure the bolsters can be tightened to a point that eliminates all movement when closed, but chances are you're not going to be able to open it, or you're going to complain about how hard it is to open.
These are 110s. One of the most primitively assembled knives today, and for the last half century. It's not some fancy spectacle with nylon bushings or bearings in some torque controlled fasteners at the pivot. It is put together by hammering a 1/8" brass pin into the bolster in hopes that when this pin swells from the pressure that it holds a tiny bronze bushing perfectly even between two brass frames so that the blade is perfectly perpendicular to this pin so it swings open and closed with minimal effort.
Educate yourself on how these knives are made and perhaps you'll have a better understanding of why things like centering and play are irrelevant when the blade is closed. There are plenty of videos out there of the Buck factory assembling these knives.
Now... if I'm spending a premium on a very limited run of 110s, I may hold them to a higher standard. But anything that's run through the regular production process - get your expectations realistic or stop buying them.
You're measuring a knife to your personal standards or against examples of knives that are assembled in a different manner with different materials. You need to measure these knives to the expectations of a 110, knowing how they are made. Did you get a good example of a 110?
And I'm not suggesting you lower your expectations. You should hold all manufactures who are competing for your hard earned dollars to a very high standard. But you should not hold a mule to the same standards you hold a thoroughbred. Different breeds and judge within what the breed standard is.
