You're totally right, when I bought the SY99 I wanted to become the new sound maker of the 90's.
After one week of testing/tweaking I collapsed and it just became a preset synth, it's actually a real monster, but its programming is a pain in the ass, and I had to do it with a slow and small lcd, though it was graphical, a great thing for the time and a huge leap from DX7.
Moreover, I recently gasped when I read this from the only (I think) SY99 emulator for Falcon (TGX-99):

What? A 91 synth? Pretty scaring.

Exactly.
Just think of FM like the Quantum Gravitational String Theory of the sound.

 

Here is an article of value in terms of content:

FM Synthesis, An Overview by Markus Fiedler
English wit Google Translater: https://www-moz-ac-at.translate.goo...l=auto&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp

Die FM-Synthese, Ein Überblick von Markus Fiedler
German Language: www.moz.ac.at/sem/lehre/lib/ks/lib/fm/fm.html

 

Its a shame Yamaha doesn't get Steinberg or do a license deal with Arturia (like Korg did with Arturia's MS20) to make some emulations like Korg and Roland do.