The AT is for sure the biggest concern with the G8X but it could also be what saved the MT.
I never thought my E90 M3’s M-DCTs peculiarities in stop and go traffic, in parking lots etc. was much of an issue, certainly not one worth giving up the relatively satisfactory manual shift sensation for.
However my wife who as me grew up driving MTs and know how to properly use it never warmed up to the M-DCT, in fact she hated it to a degree that she never wanted to drive it. So if dual purpose mean more than just for the main driver and extend to handle proper family duties I can see how the AT is a big gain since now no one in the family will need to learn how to enjoy it in grocery runs and school bus duties etc.
With the E90 I always felt bad when I took off for adventure trips in our SUV leaving my wife to with the dreaded DCT. No such problems with the F80 MT where I need to hide the keys
Truth to be told she is actually preferring AT these days.