Can any Di2 group use Y Cables now? Could I fit out my 6870 groups with them?
Fewer wires make me happy.
yes and yes.
they are basically 3 wires with a SM-JC41 junction glued into them.
They always could, it's just Shimano didn't sell them. Easy enough to make them on a DIY basis with a steady hand, some heat-shrink, and a soldering iron.
Y cable is waste of money but will work with 6879
@MechaMorgan started
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Can any Di2 group use Y Cables now? Could I fit out my 6870 groups with them?
Fewer wires make me happy.