All my relatively few Emersons have been as close to perfect .. as necessary. The ONLY problem I had was with my last Commander. It locked up too tight.
Whatever long-ago QC problems Ernie's knives may have had, I don't think they are relevent today.
It's true he does leave them user-adjustable, which means the user will
have to adjust them from time to time. I'm finicky that way -- I play with all my knives, touching them up, tightening them up, even slipjoints, tapping the bolsters to tighten the blade.
I expected a better fit & finish from an Emerson. There was some blade play. The blade was dragging a little from not being centered in the handle. The liner lock was barely engaging.
I don't consider any of those problem to be fit & finish. Blade play and centering may only need the pivot tightened. Where the lock engaged may not be as off as you think, especially if the blade was loose.
One posible problem with a knife at a shop is that others have played with it before you, and it could have needed a few minutes adjustment.
I will say you did your homework in one sense, though. It's always good to be able to play with them before buying, and if the owner could have presented the knife in a better light, in better condition, he would have deserved the sale.