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Maintenance, simplicity, weight. (Variation?)
But if you like close range cassettes dont go 1x. My 6870 1x set up is same weight as if I go 9070 (FD, RD, crankset 50.34) and 6800 11-25 cassette.
I like 1x on a winter/commuter bike.
42t with an 11-36 will take you up anything maybe even loaded.
Rotor cranks are pointless for anything really. A lighter and better shifting set up can be had cheaper EVEN if you stay native to sram.
Why would I use 1x rather than 2x11 on a commuter/light tourer. Weight? Reliability? Not sure what else there is apart from being on trend.
If its worth it, whats the best place to get individual groupset parts? I want Rotor cranks and Rival everything else.