MS are not going to market it as a 4TF console, in fact the term 'teraflops' won't be thrown about when it comes to discussion of this machine by their PR. They'll simply refer it as cheapest entry into next-gen, made for budget conscious/1080p gamers.
Achieving 58fps for current gen games =/= achieving same for next-gen games. This is the crux of issue, nobody is doubting it as a capable machine for running current-gen games at high fidelity. The main concern is how much will the specs of this machine affect the thinking of game-devs when designing a next-gen game from the ground up. Even if it can manage to run next-gen games at decent frames for first few years, at what sort of fidelity we can expect to see? What about the latter part of the gen where tools get better and devs push these consoles more, what sore of resolution will this machine drop to? Can you legitimately see a 4TF machine lasting next 7 years?
Architectures are the same, they get the same advantages no matter what. It's not a issue.
Also if they drop the resolutions on xbox series X it's nothing to worry about. To give you a idea.
Value's are different but to give a easy example.
720p = 1m pixels
1080p = 2m pixels
1440p = 4m pixels
4k = 8m pixels
Low vs ultra = 2x performance increase.
Even if xbox series x runs the game at 1080p, the 4tflop gpu will just run the game at low settings 720p to compensate.
Games are heavily scalable these days, u can already see this with games running for the switch as extreme example. A game i play at 1080p ultra settings ac odyssey with a 1080ti heavily overclocked, can be equalled with a 970gtx at low settings 900p with a way older architecture and a bit of a resolution drop.
970gtx 1080p gets teh same performance as a 1080ti at 4k in games. 4k is a resource hog and that's why i said already from day one that those next gen consoles are weak as the GPU will shit the brick straight out of the gate because 4k.
Also the PS5 won't be able to run gears of war 5 at ultra on 4k without already sacrifices, unless they cap it at 30. Welcome to 4k land where gpu's die.
What they should have done was focus on 1080p with those boxes, and it would actually be a next gen leap forwards. But they refused.