Why does the American Public accept a product from Ruger that comes from the factory with 5+ in groups at 50 yards and requires someone to buy an after-market gadget (strut) on a $700 rifle? Just to make it do what it should out of the box? People are crazy!
They do it with AR's all the time. Aftermarket trigger, sights, magazine, buffer, stock, handguard, etc.
Add to that the ARs cost hundreds of dollars more than a Mini.
Part of the problem is that nobody puts a 20x scope onto their Mini and uses it for target shooting. Mine only has a 1.5-4.5x32 scope. Good enough for shooting coyotes, BGs, deer (where legal), but not good enough for shooting the 10 ring.
It's like comparing a F-150 to a ford Mustang and complaining that the F-150 isn't as fast as the Mustang. Compare a rack grade AR with a 4x scope to a Mini with a 4x scope, shoot rack grade ammo, and that supposed accuracy from the AR just evaporates.
From the bBench the AR does have an advantage. In the field you simply can't tell the difference between a new Mini and an AR.