Many frame locks and even many liner locks do not come out very far to engage the blade. I've worked on more than a few .125 thick frame locks where only .025 to .050 of the lock thickness was behind the blade to secure it open even after they had been carried and used for a good while. I prefer the way Chris Reeve does his with ample thickness in behind the blade. His are anywhere from 50 to 75% of the lock thickness behind it when new which is optimal for security in my opinion.
The relief is not a big issue with makers for the most part. They don't cause a lot of the defeats that are frequent really. The number one complaint is locks sliding off the blade from pressure. This is much more common but as I said if you do have one that stays locked, and if you do push it to where something has to give of course it will be the weakest part of the system that gives whatever that may be. Sal said on the Spyderco forum that in his tests the cut out was the weak link and where he saw them fail. I've seen this also.
The key I think to what I'd call a proper lock relief vs one not proper is to take it down but only as far as you need to and no more. Why take it so thin that it allows the lock to compress and kink easier? Granted it may still be hard on some models depending on several other factors but it is still going to be much easier to kink a .032 lock relief vs one left .070 like a thick liner lock. There are no relief cut outs in the Strider Buck 881 folder and it bends and releases just fine, is smooth to open and close, so much so my wife can do it and that knife has .070 thick liners in it. The lock is .072 at the contact on my knife. So, in my mind if .070 can be bent and allow easy use without the need for a relief that should be the standard and no thinner. But what do I know?
Again though this does not equate to a flop.
More flops? Ok. How about the Boker Ceramic pictured in this link?
http://www.knivesplus.com/BK-2040-Boker-knives-ceramic.HTML
Here is a question for you. Why put a brittle ceramic blade in a tactical handle with thick strong titanium and a good strong lock back design? Whats wrong with this picture? Even the shape of the blade says hard user but its not. Tap it the wrong way and its history.
What about the new Spyderco Captain? Does it qualify? I'm thinking about that one just because I'm not sure exactly what that blade shape is for. Sorry Sal. Just couldn't resist but one does have to ask. Just what does one do with that blade shape? I keep thinking I must be missing something. Its probably border line but it is a puzzle to me currently. I believe I even mentioned this in my review of it.
http://www.knivesplus.com/spydercoknifecaptain-sp-c111gp.html
STR