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h2o
This calculator is useful for comparing two different set-ups.
It depends on your needs, but 1x10/11 can cover most people's needs.
Doing away with a ring does away with overlapping gears (eg small/top and big/low) and makes using the full range of your gearing straightforward: instead of having to switch back and forth between the rings and jumping from one end of the cassette to the other, you just move up and down the cassette.
The front mech is still quite crude and if you're going to loose the chain, it'll likely be off the front, rather than the rear: K.I.S.S FTW!