I haven’t ridden a T-type, because I can wrap my head around how slow the shift speed is.
How do you get across a standard creek crossing, where you have to maintain speed/momentum/pedal pressure through the water and then dump 4-5 gears quickly to get up the berm on the other side? Or do all the T-type riders live in the desert?
T-type would honestly work better as a gravel group than a MTB group, given its limitations.
As for XTR Di2, I’m not super impressed, especially for the price. I don’t really care about wireless because my bike is already put together with Di2 11-speed (with a clutch!). Maybe bike shops will appreciate the time saved though.