I find it a bit odd that YAMAHA/Steinberg have not offered a high-quality, very accurate FM -VST synth that can very accurately emulate the YAMAHA TX-802/DX7II Hardware of the past.
Would love to see a new FM VST-Synth from YAMAHA/Steinberg. released in the near future.
NI’s FM8 doesn’t cut it for me. I’m sure YAMAHA/Steinberg can offer a much better full sounding, and more accurate emulation of the older YAMAHA FM synths.
Steinberg / Yamaha have not got into the business of releasing software emulations of their hardware synths so far. I would think the addition of an FM engine and at least one FM instrument to a future version of HALion / HALion Sonic is more likely than anything else.
In the freeware zone there’s DEXED VST synth, which is sysex compatible with DX7 (more presets than one can ask for available on the web) and for me, sounds good enough.