Interesting. On mine, there's a very small space that separates the screen and the outer shell but it's uniform all the way around the screen and it looks like it's the same for other laptop owners online so I assume that's just the design.
I've had mine for a few days and have moved between laptop, stage, and studio mode more than a couple dozen times. I don't have the black marks (yet). I did run my finger along the edge that rests where your black spot is and there is a piece that sticks out (I think this is where the magnets are). I could see that piece scratching the surface over time. Do those black marks wipe off with your finger or a damp cloth?
I agree that the screen/hinge seems flimsy, though I quickly got the hang of moving it between the three positions. I will say that moving it up from the studio position (where it's laying flat) is the hardest. My only concern with the screen/hinge is how it will hold up after a couple of years and hundreds/thousands of movements. I like to think that they've tested this though!
Overall, the form factor is really cool and I really like the possibilities of this device. I've used iPads a lot and Windows 11 feels great to use in both laptop and tablet modes.
I am experiencing this issue that someone else posted here:
@drinkingtea If you haven't sent your laptop back, would you mind trying this out on your laptop and seeing if it's the same?