Resolution mattered back in 2013 when the PS4 was doing native 1080 and the Xbox wasn‘t. Now it doesn’t matter. Funny how the narrative has flipped.
1080p was the norm for TV's and displays generally by the start of this gen, and had even been possible last gen.
XO not being able to reach that for far too many games was an absolute failing on MS's part, entirely due to their mistake in focusing on the already past it's fad Kinect.
The PS4 wasn't so much a beast in the power stakes, as it was reaching the bare minimum people expected of it, and XO couldn't even manage that.
Conversly 4K even now is still barely supported by wider media and still a good few years off being the standard for TV's most will have at home.
Even high end PC's struggle with native 4K, something that won't be changing even with Nvidea's 3000 series GPU's, particularly with the developer baseline going up now we're starting a new console gen.
Combined with diminishing returns as we get to higher resolutions, as well as greater image quality being achievable with upscaling techniques like checkerboarding or DLSS, and there's good arguments for native 4K not being a sensible use of power.