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Rear mechs aren’t indexed
To be fair to @GoSteady he didn't say they were.
Rear mechs can be designed to move different distances for a given cable pull, known as the shift ratio, however I think what is agreed here (but i dont actually know) is that 11 speed road shifters and 10 speed mountain mechs operate with compatible cable pull/shift ratio and so are interchangeable.
Edit - read your reply again. We're all saying about the same thing :/
Scrabble
PhilDAS
Nope, nonsense. Rear mechs aren’t indexed and an 11 speed cassette is only slightly wider than a 10 speed. SRAM 11 speed road and 10 speed mountain bike have the same cable pull ratio. They will work as if they were designed together.
You can run 11 speed with your shifters and an 11 speed cassette and a 10 speed derailleur, road or mtb