It's the 10 in the 10x42 that's the problem.
It requires a special hub, and limits your flexibility in swapping cassettes
The 10 cog is designed to give you an acceptable high end with one smaller front chain ring.
With a 2X 50/34 setup, the 50x11 should be big enough without going to a 10 small cog.
Using a Sram 2x or Ultegra 2x with an 11-36 would still give you a pretty low gear
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You could get lost and die.
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