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More batteries to run out mid ride is one other problem.
Not quite, the batteries likely to last a lots longer on the shifters (function only to send signal), and two small pack of battery instead of a big one for everything.
It work like a cochlear aid battery where you can have two rear derailleur battery in case one die suddenly.
More batteries to run out mid ride is one other problem. And the occasional glitchiness one gets with ANT+ things (different protocol I know, but still...) would make me worry. I guess let's see how many pros hurl their bikes in ditches whilst PRing the new wifi stuff.