There are really good collapsibles out there, but honestly, all they do is shorten down a bit. They don't fold, and won't ever. Plus, many just use the buffer tube as the cheek weld. Considering many are double the cost of the A1, it can be boiled down to $1 per .1MOA or effective reliability factor, which is a big fat ZERO. Especially when you don't shoot with a vest or stand squared up to the target doing it. Moot point then, paper, deer and hogs don't shoot back.
Collapsibles are all about looking cool on a lot of guns, what's interesting is how defensive some get trying to justify them for everyone when it's really a specialty stock for CQB or urban use.
Let's not forget the original intended use of the M4 was a PDW for support troops and a few HSLD applications. Once that silly SOPMOD poster got out, tho, everyone in the Army wanted it, regardless that the overall gun has a more limited application and isn't for everyone. And, it's also obvious anyone with a specific task to shoot beyond 200m is given a rifle with a fixed stock.
Let's not rewrite how battles are fought just because something that looks cool comes along - oh, oops, that's exactly what we did do, hmmm, that sniper's potting us from 600m, hunker down and call up the countersniper team.
We need to get the games out of our heads and get our head in the game. Adjustable stocks are not the best answer for every gun.