Remember the days when competing console manufacturers created games for their competitors' systems?
Atari had AtariSoft, who made games for virtually every system.
Coleco produced games for the Atari VCS and Intellivision, their two biggest competitors in the early going.
Mattel designed games under "M Network" for the Atari 2600, clearly their greatest nemesis.
Somewhere in those 8-bit years, this stopped. Nintendo wouldn't produce games for the Master System and Sega wouldn't produce games for the NES. Do you think this helped or hurt the industry in the long run?