Is it normal for the MacBook to chip all along the front, left and right of the keyboard?

On the MacBook, I had seen chipping around the palm rest. Just days ago, I realized that there were long, narrow fragments missing from along the front, left and right of the keyboard. I don't know when or how these pieces fell off. I could see inside the computer, where there was metal. That must be exposed hardware. Gunk had fallen inside. I realized that if things were falling inside the computer, it could be dangerous. The keyboard would get hot, giving me a burning throat. I never turned the computer on again.

I read about people getting the keyboard replaced because of chipping on the palm rest. Is it normal to have so much of the keyboard fall apart so that you could see metal hardware inside? Thank you in advance.