So this brings up an excellent discussion topic. Here are two statements to consider -- one which we've heard frequently for years, and another we've heard only more recently.
1) Nintendo first party kills third party software sales. This is often used as an explanation for why third parties ignore Nintendo systems.
2) Sega wants Nintendo first party to make a specific type of game so that Sega can copy it. That specific type of game is a "mature" game.
I submit that these two statements are fundamentally at odds. If Nintendo first party kills third party sales, why on earth would third parties be actively requesting that Nintendo start making games in the genres they focus on? If statement 1 is correct, this would only serve to kill sales of the games Sega is trying to make.
In other words, statement 2 not only suggests that first party doesn't kill third party, it suggests that it helps third party. It gives them games to copy.
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