Anthony Marinelli (film composer and synth programmer for many artists including Micheal Jackson) recently made a series of documentaries about FM Synthesis and its inventor John Chowning, the DX7 is mentioned multiple times alongside the Synclavier which used the same synthesis method but predated the DX7.
About Chowning and the DX7 https://youtu.be/Mu8lHX-xuSg
Other videos about FM and contemporary applications https://youtu.be/Pl7BY4C9Cg4 and https://youtu.be/Uoiqy5mkUKE
Aboout Synclavier https://youtu.be/G5T7NBLSY0c