IMHO the ZT 301 are marketed towards Military and Law Enforcement people and as the ads says "Serious Missions,Serious Knives,ZT duty ready knives".The 301 is not ment or design to be just a cutting tools for opening mail but like things like ripping into and opening things,dugging,poking,scraping maybe even prying things like drywall,furniture,carpet,light metal,wire,mattresses,etc encountered in situations like a raid.If you are intending to do any or all of the above following things IMHO you would appreciate a extremely tight locking frame lock which is comforting to know that won't fail and always keep on performing regardless.In tough and intense situations the tightness of a knife's the lock the lessens the chance the lock will fail and that a good thing.