I suppose this is a matter of personal preference... and there are different types (material) of screen protectors out there
When I bought my car... I got myself a 9H Glass Protector... and I found that the screen protector nullified the anti-glare/reflective coating that is on the glass of the screen... which in turn made it very reflective under most situation to the point where I can't actually see the contents on screen... so I took it off
I think under most use... it's not easy to scratch the screen because it's not like your phone... it doesn't really come into contact with anything but your fingers... so I suppose other than ladies with hard objects glued onto their nails... it should be fine... at least that's what i figured
I bought one for my MS due next month. I figure the investment may save an accident at some point, and know the screen is not a warranty item if scratched. I plan to keep the car a long time and don't want to take even the small risk, verses about $20. If the glare is an issue, it won't be the first time I wasted $20.
I am paranoid, so I put one on. I hate finger prints on my devices so I am constantly cleaning the screen (Max of once a week). what if the cloth I use to clean it has a little pebble? scratching the protector would no matter as much as scratching the screen itself.
I am just paranoid and obsessive yes I know
I put one on my first Model S and my Model 3. I have one for my new Model S but I haven't installed it yet. When I put it on the 3, it was an uphill battle trying to get all the dust away out of the way.
I apply protectors to all devices I own/use that have screens that will be intentionally touched. I tend to buy equipment at the high end, but then hold on to it for a very long time, exercising careful stewardship over it; I intend my Model S to be the last car I own. Do you ever let children into your car? Passengers who wear jewelry? Ever let someone else drive it? Do you clean your screen to remove oil and fingerprints? There are lots of sources of potential damage to the screen. I installed the matte version of the Abstract Ocean "HD 5H Anti-Scratch and Anti-Shock Screen Protector," and have been very happy with it. Well worth the small investment, and easily replaced if something ugly happens.