I fail to see the issue here, I truly do.
When Steve Jobs announced the iMac the top two features he said users wanted was-
1/ Speed
2/ Display
With a rMBP battery is a major factor but I don't believe it would beat 1/ or 2/ above.
You spend £2000+ or $2000+ on a machine, to coin an apple phrase, "with an absolutely gorgeous display" 2/ above
I understand why folk including myself put screen protectors on their iPhones but putting a screen protector on a rMBP in 'normal conditions' is not needed IMHO
If you are likely to take a hammer to the screen or 'do an Elvis' and shoot a bullet at it then yes maybe a screen protector is needed.
If you are 'out and about' and there is a chance of pressure on the lid in say a rucksack or brief case then get a hard case to put rMBP in.
Obviously dont put rMBP on a chair at home where it might be sat on by Aunt Lucy.
Nb
when cleaning the display make sure the microfibre cloth has zero grit / sand / particles etc if you really want to be OCD, nothing wrong with that, shake the cloth, inspect, and run over the cloth with one of these or similar
https://www.amazon.co.uk/3M-836R-56...=UTF8&qid=1484939697&sr=1-4&keywords=3m+brush
and keep cloth in a zip lock bag and replace cloth when you feel necessary.