Almost 3 years ago I posted this question, Why didn't the A330neo and A320neo share the cockpit of the A350?, and short answers were:
"it's what the market wanted"
"there is a huge disadvantage to drastically changing the cockpit when going from an A320 to the A320 NEO or from a B737-300 to the B737-700, or 737 NG to 737 Max, and that has to do with the existing fleets."
Ok, I surely understood those ones, even if I specifically cited examples like complete transformations of B737 flight desk in 40 years history (explained as well in the second answer, thanks to sort of "compatibility mode" for old pilots).
I recently discover that new B777x has a flight deck almost equal to B787 (here a video) and not to previous generation B777 so argumentations explained so well in past answers are not suitable for this model.
Generally it seems that Boeing is "more courageous" in their updates than Airbus that seems more traditional (I am an Airbus fan but in this case, this seems the truth).
Anybody knows why B777X is so different from the original model, considering that efficiency seems increased of about 15%, something like difference between A330 and A330neo, or A320 and A320neo that share more things with original models?