Two ideas for future VST 3.x standard:
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ability to host other VST 3.x plugins - this would open the way for creating splitter plugins (mid/side, left/right, high/mid/low, transient/body, etc.) where you’d apply different processing to each split - like in Bitwig’s containers
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polyphonic outs for VST instruments and polyphonic inputs for VST audio FX plugins - this would enable polyphonic, per-voice FX