stop speculating,
educate yourself or at least wait until reviews of the technology are out.
entry point for learning more about FSR3
https://gpuopen.com/fsr3-announce/
the advantage of AI based upscaling is mainly in speculative recreation of details that can't be extracted from too low resolution image. And just a side note: limiting AI based upscaling to most modern and powerful GPUs is where it is least necessary.
Of course optimized TSR can use all the tricks of an open source FSR and then benefit from perfect engine integration. Under the best circumstances (high quality) FSR is equal to DLSS, not the other way round, can even be better in case the sharpening that filter is preferred. Subjective topic on best quality.
All the upscaling discussions is moot marketing BS to make you buy new GPUs for highest fps while most games don't really benefit from more than 60 and for VR and natural head movement necessary rate is 90 - that is in case one really cares about playing a game for what it's all about instead of binding self esteam on some wild fps figures. Going competitive online with <1s u-turns is another thing, but nobody seriously brags about shiny pixels in online shooters while gettin headshot because all of the disctracting clutter. 🤣
Fallout and Skyrim are most played games of all time, **bleep** nobody did care about fps because the engine is limited focussin on other aspects. Surely Starfield will do the same, all fps morons will whine and gamers will still play it non the less 😎