as someone using Samsung's latest AMOLED display in the S6, your claims are untrue anymore.
This was the case in older panels. As AMOLED is relatively new tech, it has been advancing. Samsung's latest panels (whether you like to admit it or not) are some of the best display panels in the world. The S6 is entirely usable with a super bright display in direct sunlight. And it has a very VERY wide display angles (I Believe 179degrees).
Now, I assume if Apple were to go AMOLED (though not convinced), they wouldn't be using "last years throw aways". They'd be using the top of the line, latest, greatest tech. Which does NOT suffer from what you've mentioned in any way