Both Sega and Nintendo likely don't want to have to deal with the hassle of supporting someone's attempts to use said 20+ year old cartridges, and deal with the dirty contacts and other defects potentionally involved. Also, convenience likely comes into play once again; why would someone futz around with making 20+ year old cartridges work when the built-in games don't need such hassle? AtGames did include cartridge slots with their consoles, but unlike the Genesis/MD Mini, those are not supported directly by Sega; besides, making them able to accept cartridges made them larger than these Minis. The only Atari Flashbacks to offer cartridge support were the 2 and 2+, which required both user modification and (surprise surprise) voiding the manufacturer's warranty in order to do so.
-Adam







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