Ground Zeroes is a multiplatform title that is 1080p and a totally locked 60fps on PS4. Be that as it may, the reason different explanations are given for the different consoles is because of facts, not bias. The fact is, many games run below 1080p on Xbox One, and all of the multiplats run below PS4. On PS4, there has only been one game before this without a native resolution, and it is twice the framerate (and wasn't delayed 6 months for polish either). Watch Dogs is the worst-performing game released on PS4.
Those are all quite good reasons to believe that Xbox One has endemic issues with 1080p, and PS4 has developer issues. (Even if that turns out not to be the case.)
I have never understood this argument. It is precisely the same as saying "I really like this Monet poster I have, there's no point to the actual painting with its greater detail. It could burn up tomorrow and that'd be meaningless."