I think they should give an option, don't forget the ZA and ZB had wood and leather. Also before the Germans took control of RR and Bentley, Rolls-Royce was to Bentley, what Rover is to MG, yet both RR and Bentley have wood and leather.
I love the 75 dash, but not grey ZT's dash. The 75 is too soft, but the ZT is just right. Externally both are excellent, you see for me neither, as they are, are perfect for me, but a combination of the 2 would be.