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He knows what your point is.
#hippyisalwaysright -
By the time you're spending di2 money, who cares about saving £25 on a £250 mech
It's not about individual aftermarket components, it's about whether OEM pricing of complete groups allows a worthwhile difference between 105 and Ultegra equipped complete bikes. If 105 Di2 means electric gears on sub-£2k Specializeds, Treks and Giants, bike factories will be pressing Shimano to get on it.
Because in Di2 world Ultegra does everything DA does, for less money.