I suspect to the cork sniffers in the audio world that ‘updates’ part is a deal breaker. It’s just a replica when they do that, and to high end audiophiles originality is important when talking about vintage components or even modern reissues of such. Some would prefer inferior but authentic tone over ‘new and improved’.
I would suspect that things like motors, capacitors and certain board level components are not serviceable or not available any more................
To illustrate my point, in the guitar community manufacturers seeking to recreate vintage 1950s pickups have gone so far as to seek out the original machines that drew out the wire in the ‘50s, the machines that spun the pickups as they were wound with that wire, etc. Do these things matter? Probably not but to the so-called cork sniffers they do and the manfacturers can charge a big premium because of them.
The guitar world is much like that. People swoon over old guitars with inferior parts and design.