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With hindsight, the DX7 and its ilk look like a weird diversion in the path of musical progress. Operator synthesis makes no logical sense. It became popular because we had the capability to do digital sound generation, but lacked the technology to do it in a comprehensible, systematic way. So the DX7 enjoyed huge popularity for a few years, before fading into obscurity.That's a weird take. I mean "Operator synthesis makes no logical sense"? He writes like FM went away.
While DX7 itself was eventually retired (and synths like M1 became popular), Yamaha made several further flagship FM synths, and FM synthesis is still widely popular, used in both plugin form (including several DX7 emulations plus lots of fresh FM implementations), modern dedicated FM synths (e.g. Korg Opsix, Elektron Digitone), and of course as FM sound engines in multi-engine synths (FM-X in Yamaha's keyboards like Montage and MODX, Hydrasynth's FM mode, Nord's FM engine, to name but a few). There are even boutique options (ReFace DX, Volca FM).
And of course even vintage DX7s go for a quite high price in second+ hand market...