We chat about videogames and videogame accessories.

The issue with emulating every console with backwards compatibility is that the hardware required to read those files in requires a fair bit of space, not just the space required to insert the cartridge. Computers can do it once people have extracted the raw files from their respective storage devices, but there's no such easy medium for people to sell physical copies with.
If the entire games library of the world was moved to SD Cards though it would be pretty feasible