I respectfully disagree with Donnation in reply 7 above.
Yes, the newer displays are somewhat more durable than earlier models, regarding StainGate damage.
But... the displays STILL HAVE a "sprayed-on" particulate coating, and without proper care, I believe they can still be vulnerable to StainGate-like damage.
So... proper use and care IS still required.
Don't let your fingers contact the display surface, particularly when opening/closing the lid.
Don't "wipe" the surface of the display with ANYTHING -- just "dust across" it to remove loose particles.
If there's something that won't dislodge with dusting, use a very soft cloth moistened with water, and as little "rubbing" as possible -- then "dry by dusting", as above.
No "screen protectors" and no "keyboard protectors".
That should prolong the display life.
My 2015 was bought in Dec. 2016, screen still looks great after following the above guidelines.