PS4 and ps4k share the same platform. An optimized game for ps4k will also be an optimized game for the ps4. That's the whole point of the move, to get better graphics and performance without increasing dev cost.
All you people disappointment would have a point if the ps4k was a completely new platform with new way to optimize the code of the game.
In reality, ps4k simply offers more power to developers in order to have better performance or use fancy effects.
If a ps4k optimized game doesn't run well on the ps4, you need to consider that it wouldn't have run well without it neither.
The difference between ps4k and ps4 are a matter of using different settings and effects, optimization will just be chosing wich effect or setting match the console the best.
If a during development they find a new way to use the gpu in order to run the game better, it will benefit all versions because they share the same architecture.
If a game runs at 30fps on the ps4k and sub 20 on the ps4, it would mean that even without the ps4k you couldn't make the game run better. It is not a matter of optimization, but a poor game design choice when you rather sacrifice framerate over fancy effects, number of objects on screen or draw distance.
People disappointed by the news should prove exactly why optimizing for ps4k is hurting the ps4, this line of thinking doesn't make any sense with the informations we have.
This is even worse than saying that a developer who put lot of effort in a pc version, is bad for the ps4 and Xbox one versions. That doesn't make any sense.
The only good point is concerning online multi-player. It socks for you that ps4k users will have the advantage.
