Last time we went through this discussion, the objection was it would result in front shifts where you might not want them.
The rebuttal was that front shifting is so good with Di2 that's its not an issue.
Guess you'd have to ride with the setup to decide.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.