It's consumer conditioning.
If the manufacturers constantly decrease quality, Joe Public gets used to it and figures it's acceptable. Joe doesn't want to complain or be a whiner, so he tolerates it and the manufacturers learn how to cut costs even further. As long as "We the People" let them get away with it, they will continue to see just how sloppy/cheap they can get.
Factor in online retailers, who may never even see the product, and you get drive-thru syndrome. The customer doesn't know he's been had until after he's paid for the gun and shipping, and is at his FFL's place. And that's IF he's "picky" enough to complain about it.
I'm NOT picking on the OP, but using this as an example. From the title of this thread, "should it bother me as much as it does?" HECK YES it should bother him. This is a perfect example of a consumer not wanting to come off as a complainer, because he's unsure if the gun in question is acceptable. If we continue to accept stuff like this, it WILL only get worse. The manufacturers are there to increase profits, not quality.
This is a stretch, but I wouldn't be surprised if guns like that in the OP are buggered up intentionally and monitored as "feelers." Then they track the sales and watch what percentage are sold and DON'T come back. This is an excellent way for them to learn what they can get away with.