so the most common caliber in the world has "no utility" for some and is used as a very effective training aide for others?
i guess i would take a look at the experience of the owners of those opinions and decide who to learn from.
the .22 may not be the best defense weapon you can find, but it IS better than a bat or an axe or a rock..... and as a survival weapon it has few peers. it can easily be carried, along with 1000s of rounds of ammo. while it may not be the most effective, it WILL take down big game. and in a SHTF scenario its a great gun to get a better gun with. easily suppressed and very accurate.
so it will teach you
and get you a better gun
and yet it has NO utility? except for zombies?
like i said, people will tell you everything you need to know about themselves if you just pay attention.