I disagree with this somewhat. I get that anything below 1080p for this gen is pretty disappointing coming off the longest gen ever, but in some cases hitting 1080p is simply a bullet point and not the best decision. Forza 5 is 1080p, and is likely only 1080p because MS required a title that they could point to in order to deflect any 1080p/60fps criticisms for the X1. The sacrifices made to get there however mean that the actual image quality is inferior to that of some games running at lower resolutions (such as Ryse). If all else is equal, than 1080p is objectively better than 900p yes, but on the same platform, that will pretty much never be the case.
It's actually not that far fetched to think that different platform owners have different priorities when it comes to what they value in games. I'd think it's far more likely that someone posting in threads such as these, looking at fps counters, and making the point (as you are) that 1080p should always be hit by these console, and anything else is unacceptable, currently owns a PS4 (and/or a PC) due to it having a reputation for being able to hit this res more consistently. Due, to this the dev may be less willing to cut the resolution on this platform, than they would be for the X1, where the console's owners are more used to this happening. You can see plenty of examples in this thread of people saying that the resolution/fps is more important to them than the texture filtering, so it probably would even be the correct choice if this was the case right?
