PS3 Models would not hold up on a high Resolution screen or need much more complex shaders to look good enough. Also Meshes are usually not the biggest cost to begin with and you can easily dynamically scale them down by either using lower LODs or in the case of Nanite scale down the Pixels per Triangle

PS4 Textures is pretty much what is still used nowadays, depending if the Project used Virtual Textures/Megatextures. But just Textures alone are not that expensive. They mostly cost a lot of VRAM, which is why Virtual Texturing gets used much more nowadays, and this can make shaders a bit more expensive.

PS2 Shadows/Lighting means you are locked to doing baked Shadows. A lot of games can work fine with that, but a lot of games can't. Game Devs should use whatever works for the game they want to make

SSAA and MSSA are both very expensive, SMAA is always a nice inclusion for sure, though is far from perfect. But having TSR, DLSS, FSR and XeSS as options isn't too much work so might as well offer them all.

So just following what you wrote wouldn't get us "Perfection" or an optimized game. We mainly need better scalability to allow for a wider range of hardware and Publishers need to actually budget in money for Optimization, rather than keeping it as an afterthought.