As I said, if you have a side by side comparison you notice the difference. Otherwise, not really.
I don't agree that there isn't a noticeable speed difference between the Note 8 and the 8 Plus. There sure is. Again, that's not to say the Note 8 is slow by any means, but the 8 Plus "moves" quicker and more fluidly.
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Yes, because Samsung likes money:
https://www.macrumors.com/2017/10/02/samsung-4-billion-making-iphone-x-parts/
They can make $ by still supplying good OLED screens, but not the best OLED screens.