Dura-Ace Di2 with an internal battery is the lightest groupset Shimano make. So the only reason to choose mechanical is because you prefer it, it's not wrong, it's just a choice.
^Berretto needs a decent track cockpit, shame as that's one hot tomale.
also heard that under pressure the electronic is shifting perfect.
How much pressure? And why would you take your bike diving?
@Patfatenough started
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Dura-Ace Di2 with an internal battery is the lightest groupset Shimano make. So the only reason to choose mechanical is because you prefer it, it's not wrong, it's just a choice.