Does size matter? Question to jambiya lovers

[motan]

Thank you for your serious response. I agree with most of it, and I was a little provocative in my first message, just for sake of eliciting a response. It is just so obvious that not the actual use was the main consideration is the design of many weapons, and particularly in the design of daggers and clubs. If a dagger is small but can be held comfortably in the hand, it can be used effectively.
I also agree to the general order of use for fully-armed fighter: first a projectile weapon, sling, arrow, javelin or musket, then a speer, halberd or similar, then sword, club, axe and such and finally, the dagger. Using your dagger in a fighting means that you lost all other weapons and got too close.. Street fights are, of course, a whole different matter. If I ever had to use and edged weapon (I sincerely hope I never will), I would probably run for the kitchen and not to my collection..
And finally, to show that daggers can be used effectively, a story: In 1965, in a well documented case, the last Persian leopard in my country was killed by a bedouin herder with his shibriya. They surprised each other in a cave and after a fierce fight, where the bedouin lost three fingers, he managed to stab the leoperd in the neck and kill it.