Originally Posted by
Jeff Wills
I think that's called "maintaining plausible denialbility". If it doesn't work, it can be swept under the rug with a minimum of fuss.
I agree with operator on this one. Shimano never intended Di2 to be an automatic transmission and it's target market wouldn't have accepted one anyway.
If Di2 didn't work it would be because it's shifting was unreliable or unpredictable. Shimano did a huge amount of prototype and field testing before releasing it to the market to assure it would work as advertised.