I'm not sure you will miss it IMO - The drivers display is so good and customizable (including navigation etc) Its one of the things I really like about my Taycan.
I very much doubt it could be retrofitted BTW, on my BMW i8 it was basically a projector display built into the top of the dash that would be really difficult and costly to add later.
I very much doubt it could be retrofitted BTW, on my BMW i8 it was basically a projector display built into the top of the dash that would be really difficult and costly to add later.