I can only speak for my own laptop - but a search on these forums it seems to be an issues across a huge variation of thinkpads, not just yoga and not just touch screen. My previous Lenovo was garbage for a lot of reasons, but it was a non-Thinkpad touchscreen Yoga and it never had these scratching issues.
I agree. They claim it's your fault because the laptop must have gotten weight put on it while closed. My laptop is always only carried in a 2" padded cover. Apparently carbon fiber is not actually strong enough to hold all of the bits in place under event he coziest of circumstances.