- Games on Switch 2 will expect around 10 GB of RAM, which means extensive patching of executable and assets to fit into 3.25 GB (or 6.5 GB if you have 8 GB RAM mod)
- Cortex A78C is ARMv8.3 core while A57 is ARMv8.2 core. Which means some instructions are not intercompatible between Switch and Switch 2.
- Whole shader recompiling issue comes forth
- Any OS/NVN call exclusive to Switch 2 would need to be hooked and be properly processed
Sometimes it's a virtue to simply think before posting since the first point should be obvious for anybody. And people are paid a lot of money to do the first point - downscaling games from big consoles to small consoles with access to much better resources than modders and hackers.