Yes, the paint maybe too brittle. Whatever the reason it certainly chips easily.
Has anyone had any success with getting dealers to fix the chips? In my experience they are normally very good at responding to requests if they are at fault.
If it was just "one of those things" that might happen to any car I would accept it and leave it at that, but I can quantifiably show that the Lexus has a much lower chip resistance than a Ford Fiesta and (more importantly for Lexus) a BMW.
BTW, my car is sapphire blue - it seems this is especially bad for stone chips?