And miss out on the opportunity to change a few lines in a text file and resell the games as remasters? You aren't looking at the business case here. :P
Obviously not all games will get enhanced, some games have fixed framerates, fixed resolutions and have been abandoned by the developer, so it wouldn't matter if you could plug them into a PS5, they will play identically.
Games with uncapped framerates and dynamic resolutions should see gains.
That's provided Nintendo takes a Microsoft approach and lets games run to their maximum capability irrespective of the hardware, rather than limit the hardware for Switch 1.0 compatibility in some way. (I.E. Disable SM's, reduced clocks etc')
Alas. We will need to wait for the reveal to know any of the details on what the backwards compatibility features/nuances/restrictions end up being, we can hypothesize until the cows come home and be completely wrong.
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