I dock/undock my Switch daily and have seen no evidence of this. I did put a screen protector on it eventually (after about 2 weeks of use), but that was more for safety reasons outside the dock than the actual docking process.
If you even look at the inside of the dock, there are protrusions on the left and right that line up with the Switch's bezel which would prevent possibility of screen scratching. Putting the Switch in the dock doesn't require careful examination to achieve this line-up either. It's common sense and natural. For example, if someone doesn't use common sense/care while inserting/removing discs from an Xbox One, they're going to scratch the disc. Now, is that a design flaw on Microsoft's part, or is it careless on the person handling the discs?
