This isn’t so much about layout. The whole red arrow, malicous applications can’t break out concept confuses me. At best i think a trojan can’t phone home, at the worst I think that the workstation is infected. I have a firewall that keeps infections isolated if and when I have them and its linux so it shouldn’t be infected in the first place.
So this leads me to another idea that the Whonix workstation would be a good place to develop malware. This may indeed be true but the idea made public could have an impact on trustworthiness in general and more widespread adoption. Most of my friends are suspicous of anybody looking at privacy and anonymity anyhow.
But I could see the idea of keeping a buggy program in. If you were to say something like bugged application in development, I think the general public, or at least myself, could see the whole project as good instead of suspicous. or “used by suspicous Tuggboats” 
Further along these lines, some application development tools bring in some revenue streams from sources with more resources. A bigger fish so to say. It almost has to be a part of a bigger idea, with isolated entities" to engineer these types of modern revenue streams but that way outside this topic.
Suffice to say the red arrows and their captions confuse me and lead my mind to wondering.