I recently took my 2015 Scott Scale 910 in for a service to be told by the shop that I had worn the chainstays down.
Now I suspect that what they are referring to is the design of the frame (particularly as it's even on both sides) - sure there's some paint wear from gritty mud accumulation around the wheel when riding through a UK winter, but I'm certain it's not worn down the carbon.
(Well not certain enough not to be posting here).
I'm really hoping another 910 owner can take a look (pic attached) and make a comparison before hopefully telling me I've nothing to worry about!
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Thread: Scott Scale 910 - chainstays