Resolution in general. Native 4k will eat up most of the GPU's extra resources. In a world where Microsoft wants to sell the Scorpio next to the PS5 as a cheaper system & have it support next gen games, a 4k mandate will make that highly unpractical for developers. 

Well at least wait to hear what solution Scorpio will use, so that at least you could get wider use of it... though i think the chances are greater that they plan a partnership with Oculus.

If you haven't heard, being early adopers for VR has been meh, and that doesn't exclude PS VR and what surely will be a tech-demoey, first wave lineup. So its best to watch the dust settle a bit and worse case scenario you save a few bucks and have a better quality library to chose from after some time.

Obviously incorrect and lacking a proper technical detailed answer.

Ermm... Ok. 

Until you care to elaborate in a meaningful response, I'm sticking with the widely akcnoweldged notion that higher resolutions are a GPU drain, hence PS4 Pro having 4.2Tflops versus 1.8, and rendering Horizon at 2x1080p instead of native 4k. Hence why several games utilising Pro have improved graphics at 1080p whilst having lower graphical settings in 4k (which isn't even native 4k)

Glad I don't care about resolution this or that. Give me great gameplay at a great frame rate, I'm happy.

I believe that 60fps is easily possible on Xone and PS4 as well as PS4 pro and Scorpio. The problem is that higher framerates don't sell as wel as better graphics do. Even if MS outfits the Xone 2 Scorpio with 30 terraflops developers will find a way to utilize all those terraflops for graphical ends and keep the framerate steadily at 30. If you want 60fps on almost every game buy either a nintendo console or a gaming pc. Sony sure as hell won't offer it to you and MS will offer a little more 60fps games (Forza Motorsports, Halo etc.), but the mass will forever be in 30fps on PS and MS consoles.  

Depends what you consider twice as powerful, a 16GB GGDR5 a twice as fast CPU, 8.4TF system isn't all that bad and considerably more powerful than the Scorpio. 

from what perma said 6TF also doesn't see really capable of true native 4k unless they make a lot of compromisses. But let's see what they will deliver when the time comes. If used the right way sure the 6 will allows better graphics than 4.2. but if only used to force 4k instead of the checkerboard it may show very minimum gain and perhaps on 1080tv have a worse iq.

Well that wasn't the case with this Gen...PS4 was the most powerful with respect to the competiton when the gen kicked off.  What matters is games and price point ultimately. 

8 teraflop GPU and more RAM might be enough to push Scorpio 4K/30 fps games to 4K and maybe 60 fps with extra polish on textures and effects.

But not enough power to really demonstrate a significant generation leap post Scorpio. With those specs all PS5 games could be cross gen with Pro and Scorpio.

On a sidenote, I believe MS is making the Scorpio more future proof with higher end specs. Between the massive GPU boost and UHD, it will likely share games with the next Xbox as well. Sony may have to follow suit somehow or thats gonna be a huge advantage for MS.