Originally Posted by
Camilo
They're both great, but didn't at all address any deficiency that I've ever experienced personally. I think this applies to the great majority of riders.
While I would agree (especially for shifting), there doesn't need to be a deficiency to benefit from an improvement. Most technical things improve incrementally over time and bicycles are no exception. Electronic shifting is just a refinement of the derailleur drivetrain. Hydraulic disc brakes are a little more than that, but that's off-topic and been flogged to death many times!