Since you know a lot about this do RGB OLED have this flaw?
As far as I am aware all current AMOLED Panels used on smartphones are pentile and Samsung's are diamond matrix pentile.
With a 1440p diamond matrix panel.
1440P has 3,686,400 Pixels. On a 1440P AMOLED screen there are 3,686,400 Green SubPixels, 1,843,200 Red Subpixels, 1,843,200 Blue Subpixels.
This means there are 7,372,800 lighting elements in a 1440P OLED Screen
A 1080p LCD had 2,073,600 Pixels with 3 subpixels per pixel
This means there are 6,220,800 Lighting Elements on a 1080P LCD Screen
So the difference in actual pixels is almost affectively the same. So someone saying a 1440p AMOLED screen is vastly sharper or night/day different to a 1080p LCD screen is mostly imagining the differences than actually seeing anything majorly tangible. They may indeed be confusing brightness and saturation differences and not actually resolution / sharpness.
A 1440p LCD on the other hand has 11,059,200 lighting elements which is significantly higher than the current crop of pentile Amoled displays on devices.
So yes, should a full RGB OLED panel arrive it would have the same 11,059,200 lighting elements but offer the benefits of increased contrast over the LCD and would likewise be much better than the 1440p pentile in the Super AMOLED devices we have today.
Indeed if they could go to full RGB AMOLED it would mean they wouldn't need to go to 4K to improve sharpness and the quality even in VR Scenario would be improved significantly over what they offer now and it would be much more resource friendly than a 4K panel.
So yeah, if we can get full RGB OLED on a device in 2017 it will be better all round arguably than the 4K diamond matrix pentile which again because of that subpixel arrangement wouldn't provide much benefit over a 1440p LCD or RGB OLED and would require far more power and resource to power which would be a negative.
I could hazard a guess that Apple's reluctance at taking on OLED is because they are waiting for the full RGB OLED panels to arrive. If RGB OLED does arrive next year it will be great for all ...