I don’t begrudge ANYBODY the way they use Cubase, and I’m open to knew ideas, but I never use instrument tracks,and always use the Rack. I browsed the thread and noticed a number of the reasons why this is so, and there’s even a couple good ones not mentioned I’ve forgotten. 
From what I gather, instrument tracks are a nice way to search out a particular sound, without the steps of creating a MIDI track, assigning it, and opening the VSTi. But in all honesty, that’s not how I work