Well John it seems you have a hard on against the ATLATL- or at least folk's appreciation of it. I like to think our ancestors had a very large , mixed bag of ways to solve every day survival problems. Much like we do today, excepting the industrial processes we've inherited from our great, great grandparents. The ATLATL has been a part of that mixed bag of problem solving tools a lot longer than guns, bows and arrows. It's actually still used in some remote societies still extant on our planet. What I am suggesting is that not all people used ATLATL for everything all the time- that for some applications (and I, being a reasonably intelligent modern human, admit to not knowing ALL of those applications as I am not a hunter gatherer--BUT I AM fascinated by ) it was actually the best available. Thus it exists. It exists because it was essential for some activity----for thousands of years.
I've been making/playing with ATLATL for almost two decades, using absolutely anything I can get my hands on to make/experiment with them- modern materials included, and what I can tell you, empirically anyway, is that there is a wide range of purpose you can build ATLATL for. Are you hunting Birds? If I were to scare a large flock of birds (and I have every reason to believe flocks of game birds were larger in prehistory) I could reasonably assume I would hit one or more birds with the ten or so light-weight cane darts I launch at them during the ten or so minutes it takes them to hit the sky. Am I hunting wooly mamoth with ten to 15 men from my tribe? Well if we all have some pretty heavy duty darts and we stand real close we will bring down that beast, yes? well. It happened. If I am a Mayan warrior tasked with killing armored Spanish invaders, along with ten thousand other ATLATL warriors with my ATLATL then yes I will. You've used a lot of sweeping generalisations to discredit the ATLATL. It's fine for you to think whatever you want, but if you honestly want to know the ATLATL, why not make a few (or a few hundred- it's not difficult) and see how they work----then you might appreciate better it's place in humankinds toolbox. Today, in America, we still use the technology-----to throw balls for our dogs. Also, whomever didn't know wether or notthe Aztecs had the ATLATL-----ATLATL is an AZTEC word.