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Today is my one year anniversary of taking delivery of my NX350 with the 14" screen. I removed the protective plastic film before leaving the dealership parking lot, and have had bare glass ever since. 12,000 miles later, not a single scratch on it. I don't think a protector is a necessary thing, but YMMV.
Agree with Dorsai - we left the "from the factory" protective plastic cover on for a bit but it was easily scratched/looked gross so we took it off. And... 12,000 miles later it remains flawless. Unlike a mobile phone, the screen in the car just doesn't have nearly as many opportunities to get scratched... So unless yer really hard on things (or drive people around who are!) I definitely don't think it's necessary. (This coming from a person who ALWAYS has a screen protector on their phone FWIW)
I agree with other comments. I took off the plastic film pretty much right away. I have a super huge eyeglass cleaning cloth I got from my optometrist, perfect for cleaning the screen and the piano black parts and keep it conveniently stored under the phone charger and I think that will be fine for me. My MIL is required to wear oven mitts in the car to keep her daggers off the interior. Whoops, I was only dreaming about that last part but she won't touch the screen anyway.
Maybe the smaller screen is different because ours seemed to have scratches on it after we wiped the finger prints off it with a microfiber cloth. We leave our screen off 99% of the time and it really shows up stuff then.
Have you removed the plastic film yet from the screen. Took me three months before I realized it was the plastic film that was scratched. The original 9.8 screen underneath was and still remains perfect after a year.