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or if you ride really "extreme" terrain. like miles of pavement and then steep or technical dirt. i'm most bothered by drivetrain efficiency when i am on pavement, so being able to sit mid cassette with a 50t big ring is nice. for me at least unless i had a good bit better w/kg i'd be really grinding on some of the harder dirt climbs in my area with a 1:1 low gear. obviously fitness dependent.
Riding on the tops is a no-go for me on tech stuff.
I just don't see the benefit of carrying the extra weight and complication of an FD on a bike designed for off road. So far, most of the pro-FD arguments here seem to be, 'I just use the small ring off road and cross-chain' which doesn't leave you with any of the 2x chainline benefits. The only thing you're left with is a bit more range, but modern 1x systems have plenty unless maybe you're racing and/or loaded.