So what if you can see different colors when tilting the device. It happens on all AMOLED on white screens.
It's not like a "pinkish tint" will effect the color and quality of what you're watching. "I have pinks on my edges", and? It's not effecting anything.
The problem is that it is so noticeable or too drastic in the s8+, otherwise why I could never notice anything on the s4, s5, note 4, nexus 6, oneplus 1, 2 and 3, s7 edge, note 7 or even on my first s8+ that was exactly the same model.
Even with the change of colors when I tilt, in my personal preferenc this screen looks a lot better than LCDs I've had for example on lg g4, v10, g5, v20 and iPhone 7.