Don't get me wrong, nothing wrong with a DX7 (still got my second one, with a Grey Matter E! expansion board), it WAS the sound of the 80's, and some of those FM-ish sounds have made it to the basic bread and butter sound category, copied even by the Nord!
But the vintage keyboard revival has shown that, after an initial flirtation with FM, and then ROM-plers, they just don't stand up to the musicality that the real thing evokes. This is where the Nord shines, because not only are the sounds themselves VERY accurate, but far more importantly, the way they RESPOND to your playing is very accurate too, and the effects and amp simulators only add that extra sheen, too.
My G70 has some VERY good Rhodes's, but the response to velocity and the way they break up (or rather, don't!) when you spank them puts them behind the Nord's, IMO. And the clavs and Wurli's in the G70 are WAY behind a Nord in authenticity.
For those of us that grew up with the REAL gear (I had Rhodes's, Wurli 200's, Clav D6 AND a B3 back in the day, amongst others) being able to go back to playing styles long lost because of compromises in the sounds is worth every penny. The DX7 never made me FEEL I was playing a Rhodes, the G70 doesn't make me FEEL I'm playing a Wurli, but the Nord's come the closest I have ever been to FEELING I am playing the original....
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An arranger is just a tool. What matters is what you build with it..!