You are still not allowing VSTi Plugin chaining, you can only load an VSTfx after the first slot.
You may want to send the midi chord track to a VSTi then the midi out from that to a different VSTi with different sound/instrument.
I may have a VSTi like Rapidcomposer and want to send the midi out of it to a VSTi instrument.
I may want to send midi out of a VSTi to reajs vst then out to another VSTi instrument.
It should chain both audio and midi out to audio and midi in of next in chain.
It may be a VSTfx with midi out.

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