This partly exists in one form or another. But let’s just keep these dreams going and forget the realism. I want this ultimate hybrid plugin wrapper/builder. Like in Reaktor you have an ensemble and you can pick things apart, grab processors from one, put them into another ensemble or build something with bunch of blocks from all over the place. Also, think of patcher from FL Studio where you also can design your own UI for a front panel view (or presentation view in Max). But instead, you could go with anything: DAW native plugins and third-party VSTs. You can get away with this on VCV Rack if you have VST-host modules but I want something that helps bit more visually and isn’t based on virtual cables, something you could redesign to your own taste but keep the functionality and do different ways of routing.
Now, the prototype idea. I decide to use oscillators from one VSTi, let’s say Serum because there are some great WT warp modes in it. I could highlight the entire OSC tab in it, like if you’re taking a screenshot of this one area on your screen and add it to my hybrid VST front panel window. You know, a cropped version of original plugin. Then I decide I want some dynamic EQ, I choose FabFilter’s Pro-Q3, again, screengrab things I want to see and modulate, add it to my hybrid where I can resize it and dock it anywhere in that view.
The reason why I would love that is that I hate floating windows. Having everything docked on a single board just makes sense to me. Like you have with Live and its native effect chains on the bottom panel but more verticality. Extra points if you could re-design this hybrid synth/multi-effect visually. Overhaul entire UI, change all dials into same color and to make it look like a completely new self-made VST that is a mix of bunch of other VSTs. Everything is followed by your taste and match your workflow. This means great convenience, you have stuff you really like from one, then some parts from another.