Never said they are resource hogs, simply said they added little RAM compared to XB1, and you must use some of this additional RAM (I don't know how much) for new features, so you can't expect a much higher resolution, plain and simple. But given the higher computing power and a little more RAM you can expect, at a same given resolution, more and computing heavier effects applied, for example better antialiasing, better anisotropic filtering, etc. Simply don't expect little more RAM available to be wasted on higher res, as it would eat RAM stealing it from other features that could have a better visual result.