@fillertrack Outside piracy, there are some arguments against shipping a global emulator and games as DLC.

As SNES cartridge could contain additionnal processors, the emulators needed for running two games may be slightly different.
On PC, emulators try to recognize the games and adapt their behaviour accordingly, often by changing parameters of the emulation.

In a DLC system, the application would need updates for running new games. Updates that may break the already released games. Checking that there is no regressions in already released games is very expensive.

The care for quality leads to release an adapted emulator with each game.