Jules98 on 16 February 2024
This one seems pretty obvious. Games with dynamic resolution and unstable framerates will see improvements in those areas due to stronger hardware. Faster load times too, if the speed of the storage medium permits it. Any improvements beyond that will require patches. Whether those patches will require extra payment (or if they even happen in the first place) will be up to the publisher. Some games might get a dedicated "Switch 2" version. Getting that version for free if you own the Switch 1 version is rather unlikely. There is no reason for any publisher to be that generous, especially in the current era of monetization and rising dev costs.
