It's simply a question of good judgement and good taste . You can construct a homebuild or restore a vintage classic to a very high standard , but still be deficient in both of the above areas!
There's nothing to stop you from restoring an E-Type Jaguar or a TR-4 and fitting Puerto Rican hub caps that revolve in the opposite direction when stationary. Or LED's in the wheel-arches , or having "drug dealer" blacked out windows.........But would your taste allow you to do that ? If it does and you're happy , then fine !
Same with aeroplanes though isn't it ? Surely , if you're happy with the conventional , analogue engine instrumentations accuracy , then the other constituents of the 6 pack can be easily contained in a removable tablet device and referred to as a cross reference to the time honoured and reliable instrumentation if/when required .
Take the Carbon-Cub for example , about $270.000 of "new technology" with a hideous great carbuncle of unnecessary digital dogsh*t right smack in the middle of the panel.
Whereas , for a fraction of that price , you could acquire the real thing !
Like I said,,,,,more a question of taste than anything else. Thankfully , we're all different. The more punters there are for Carbon Cubcrafters type machinery , the more proper classic/vintage types are left for people whose taste leans in the other direction .
Fine with me...!