With reference to old-style instruments, flat-panel displays are getting bigger and bigger. No reason the same style cannot be used digitally to mimic the sacred six.
I believe we just pointed out that a digital display does not have the same attention getting power of the actual instrument.
With regard to the standby instruments, why would we want to do that?
Diversity of instrument types can have benefits.
We have already put the 'sacred six' on the PFD, haven't we?