@icedquinn A good amount of synth parameters become redundant if "knob per function" is a aimed goal. The problem with the DX7 and basically every synthesizer until the Roland SH-201 & Korg MS2000 was that companies saw an opportunity to reduce costs, turning so many into LCD menu diving tedium. At least every flagship keyboard after the 00s generally has the excuse of having over 9000 points of modulation to a rough official external program.

The newer Opsix comes closer to what was possible to make modifying FM easier, though I hear that it's far from perfect.
Not related, but oh wow the Microkorg 2 is real and it even has more than 4 voices of polyphony!