Yeah, when I first got my 85mm and the matching Canon hood, I thought "There ain't no way this thing is going to hold up. It's gonna break the first time it gets a little bump." That was about ten years ago now and it's gotten bumped hard enough a few times to knock it off the lens, hasn't had an easy life and looks a little beat up now. But it's still in one piece and still does the job just fine.
I can imagine the Canon Repair Tech sitting there with that EW-83H for the 24-105mm on his bench in front, thinking, "Now what, exactly, am I supposed to do with this?" There really isn't much for them to take apart and repair. It might even fit just fine on another 24-105. I'd probably have just stuck a piece of tape on the lens or hood, or put a drop of glue on the hood or the lens, or used a Bic lighter to melt the plastic of the hood slightly to make the fit tighter... Or just managed somehow with it being slightly loose, so long as it didn't fall off or hang down in the way of taking a shot.
If you think a slight wiggle in the lens hood when it's locked in place is irritating, just wait until that 24-105 develops "zoom creep" or the red ring pops off, both of which are rather common occurances with that particular lens. Not that either of these or a little lens hood wiggle has any significant effect on taking photos with the lens!
Methinks folks are over-analyzing things a bit here.... After all, it's just a frickin' lens hood! Use em til you break them or lose them, then buy a replacement.