You have brought up a valid point. The Greco may not be for everyone.
But I can assure you that my Greco Falcon is opening and closing very smoothly after using it just over two weeks. It no longer feels 'stiff', it just takes a robust thrust to get it going. I am comfortable with this, as it doesn't have the 'loose' feel of most of my production folders which I can open with a quick downward 'flick' of my wrist. What I mean is that the ball and detent of the Greco holds the blade tightly closed(it is not stiff in the pivot joint) and this to me is a good thing.
After overcoming that initial resistance of the ball\detent it is no more difficult to open than say my BM AFCK when I tighten the pivot up a bit. The great thing is that the Greco, unlike my AFCK (even when the pivot is tightened), has absoulutely NO AND I MEAN NO side to side blade play whatsoever. There is also no flex in the handles of the Greco. I can squeeze the scales and liners on my AFCK almost to the point of touching, something I cannot even begin to do with the Greco.
The integral\frame lock is tight enough to offer great confidence, and at this point I can close the knife with just one hand, though it is definately harder than the liner lock on my AFCK.
As I pointed out in the review above, this type of feel, for want of a better word, is not for everyone. I happen to like it myself.
Obviously, there are many knives available that might better fit your particular job needs. This is one of the great aspects of modern knifemaking.
Mongrel