After exporting native plugins in VST3 format and switching to the generic editor in either Cubase or Reaper, there are a bunch of MIDI controllers that also appear. Here's an example:
As you can see, the only used parameters on the plugin are dsp.input1, dsp.input2 and dsp.input3. There are no output parameters defined. In terms of the export options, both "Include GUI" and "Use generic params" were unchecked.
That first example was a plugin exported using the default skin, without a GUI. My second example was exported using LetiMix and, despite using the same export settings, in addition to the MIDI controllers being visible, there are also the remaining unused parameters showing up:
I've checked the manual and I can't see a reason why these would show up, provided "Use generic params" is unchecked.
My system: Windows 11 Home 22H2 64-bit AMD Ryzen 7
Ideally, in the generic editor, all I would like to see is the parameters (input or output) actually being used.
Thanks for your time!
