Visited my local bike shop today and ended up chatting with the mechanic about gear inners. He told me that for 11 speed setups the gear inner should always be a coated cable. He mentioned that the standard cables caused premature wear to the shifters. This being due to the 90 degree bend in the wire given that the gear cables are hidden beneath the bar tape. He said that the additional stress at that point caused the standard cable to act 'like a cheese cutter' through the plastic guide. Having not heard of this previously I carried out some research online and didn't come up with anything. Has anyone heard of this or have opinions regarding the use of coated cables etc?