It's not dooms day prophecy. It's a problem that exists on certain units. No, you may not get an affected body, bu you may. I admit it's a crapshoot. But I am not willing to take the chance. It's silly to not be forthright that a problem does exist. Not being able to nail focus at wide apertures at less than 15' is a big problem if you get an affected body.
Yes you do forecast doom and gloom in most of your posts. You seek out defects where none exist (60D peeling for example.. yours isn't). From what I see, the 70D is a great body, and for most uses has no issues. Most users haven't seen what that one thread seems to show, so I honestly don't know what is going on there.
I agree with the post above that leans toward possible issues in low light... gee, does any other camera have low light focus issues? And even then it only shows up with the lens wide open. Kick up the ISO (the 70D can handle it) and open the aperture another click... problem solved.