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Your wireless drivetrain might not be as safe or secure as you think - Canadian Cycling Magazine
(cyclingmagazine.ca)
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Would be more stuff and moving parts. Now you've got little electric motors/servos involved, batteries, etc. I'd be pretty surprised if it saves any weight.
Less moving parts at the switch, or none. Switch could be all electronic/digital/wireless. No more cables. Also without the cables requiring an external input mechanical connection near the derailleur, there's better opportunity to "seal" the inside electromechanical components from the outside world.