Please backup your claim with a link that shows how.
This is an example of all the sites that I've found: http://www.everymac.com/systems/apple/macbook_pro/macbook-pr...
It says ...
One size that Apple does not offer is the actual native resolution of each display, no doubt because icons, text and other interface elements are too small for just about anyone to read.
In any event, the issue is customers should check if this product will actually render the full 5k resolution without hacking and if it is usable at the resolution. It is abusive to sell a product with a spec that you can't actually use. But Apple is all about form over function.