I'd say well over 99% of ammo expended in the USA is for reason other than use on living things. Most of it is used to make holes in paper targets. Where are you at that firearms are generally used for inflicting injury instead of punching holes in paper?
I spend several hours each week teaching children how to make holes in paper between 33 and 300 feet away in paper targets; hopefully one of them might represent the USA in the Olympics in the future.
What a thing is used for and what a thing is designed to be most efficient for are not the always the same, I'll grant you. I'd suspect that the first designs weren't made with the intention of poking holes in paper.
There are few options for delivering lethal injury at range that can beat the efficiency of a firearm. At the same time, there are few uses for a firearm outside of delivering lethal injuries at range that some other device wouldn't be more suited towards.
The exception might be, in the example of paper targets, the rate at which you can poke holes in them. Even that, really, is dependent on highly controlled circumstances. For instance, having an adequate supply of ammunition on hand, possibly having multiple guns so that heat or powder residue build up don't become factors, etc. If you take away the ready supply aspect (a feature of the infrastructure invested initially for the purpose of delivering lethal injuries), and compare the same investment of resources, time, and energy all they way from extracting metals from the ground to pulling the trigger, there would certainly be more efficient ways of rapidly poking holes in paper.
For the task of poking holes in paper, I'd call a firearm over-
engineered (to avoid the obvious pun).
I tend to lean heavily towards efficiency (what task it is most suited towards AND what other options might be more suitable for the same task) when considering what a thing is "for." I recognize not everyone may think in those terms, however.
As far as a demonstration of marksmanship or martial prowess, I'm far more impressed by bowmanship, personally. However, that is an entirely subjective observation, I admit.
In any case, poking holes in paper regardless of which instrument is used to do so doesn't really seem to have any larger purpose or applicability towards a beneficial result of any kind
in and of itself. It is a stand in for demonstrating the ability to kill something (since having a ready supply of living things to kill would probably be the most limiting factor in such a demonstration). Whether killing something is beneficial or detrimental, again, goes back to being dependent on the context of a given situation.
I've now put way too much thought into what began as a drive-by humorous comment :9.