I used to have a half-step+granny gearing on my Sequoia (but went to a touring triple now). I use an 8-speed in the back with the DO spacing spread to 130. I have to agree that with an 8-speed, you definitely *do not* need the half-step/granny setup. To really leverage half-step gearing you're just going to be shifting almost twice as often and would have to be really, really finicky about cadence.
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