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12-15-21, 08:39 AM

#13

ClydeClydeson

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Lack of a front derailleur frees up a lot of design constraints re. seat tube placement (or if one is included at all), BB spindle length.
Chainrings designed to encourage the chain to jump back and forth also (surprise!) encourage the chain to jump off or not engage correctly some non-zero percentage of the time.
weight isn't a big part of the issue - 1X drivetrains usually have absurdly large cassettes compared to multi-ring setups, and 1x is also used often on bikes that are not really sensitive to small weight losses, like fat bikes and DH or Enduro bikes. The lightest road bikes still use 2x drivetrains.
futzing with two shifters can leave your drivetrain knotted up when trying to make too many changes at once; one shifter that can access all drive ratios sequentially does not have this problem.

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