My new-to-me 2015 15" MBP is the first MBP that I've gotten with a pristine screen (was just replaced by apple due to stagnate by previous seller) so idk if my usage habits ever cause wear. All of my previous MacBooks had wear and tear because that's all I could afford. I've considered putting a microfiber cloth in between the keyboard and screen to keep the keys from rubbing but that just seems like a hassle and I'll look weird in public doing that haha.
I keep my screen and keyboard relatively clean and only have a small novel and an iPad mini in the same part of my backpack as my MacBook so I doubt there is any pressure being put on it. I check the screen periodically and the only marks are smudges from dirt/other grime. No keyboard marks that I can see.
Owning a MBP is like owning a German car. Would you take a Porsche through the parts of town with pothole-filled roads and take it through crappy carwashes, or would you keep it on nicer roads and hand wash? MacBook Pros have been fragile for years...it's not a new thing. A little bit of extra care and they should last a long time.
I think Apple should make the coating thicker and strengthen the lid to reduce flex, but it is what it is until they redesign. Don't put it in your backpack with tons of heavy books, periodically clean the screen and keyboard with a partially damp microfiber cloth, and then just use it and enjoy it. If it's still under warranty, make them replace the screen. Otherwise, I'd just live with it.
Other ultra-thin notebooks are not immune from keyboard wear as well. Apple, Lenovo, etc cannot escape physics. I've seen Thinkpad T460s thin notebooks with keyboard wear on the screen as well. If you want a sturdier notebook, I'd get one of those extra thick business class mobile workstations. Thinkpad P-series, etc.