I think the manufacturers have been adding newer styles, which is necessary for perpetuity, but some of old guys are still around that enjoys nostalgic music, along with the people who also hear them play it.
As far as the sound of '70 and '80 arranger is concerned, I know that today's arrangers sound much better with any genre.
But, to each his own.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact