...In pursuit of the false god of wireless shifting, a la SRAM. I think it now has batteries in the mechs that need separate charging. ie faff on a long ride.
Oh yeah, think I talked about this a while back and someone said that the button cell wireless shifter thing is an option - you can still run it fully cabled up for proper use.
That would be a "no" from me. Why would they even stop that?
I've got 12s mechanical on my MTB and that works fine. Not even seen 12s Di2 yet though.