God, that would be terrible.
I fail to see how that would benefit consumers and games don't seem to benefit much from being on a single platform. I mean look at PUBG or Ark (both launched on X1 first). If the game is poorly optimized to begin with there is little benefit from being focused on a single platform.
Multiplat = more sales. If a developer doesn't have the resources to optimize their game for multiple platforms, they should launch on one console. But if the sales potential is greater as multiplat, then they could bring in more people.
Sometimes developers get paid to go exclusive or a timed deal. But realistically Sony and MS won't do that often. Its not financially worthwhile, especially for the platform with a significantly larger userbase.
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