In general dynamic relations can have many variables - but the variables in this case are pretty cleanly defined, and from where I'm watching it seems to be by design. The instruments are being recorded in position in the same hall - based on the diagrams it seems the plan is very much to fill out the whole orchestra with their seating intact in relation to each other. The array of microphones will be in the same position for all, and I would assume they will be the very same microphones each time. Based on this setup the relations in dynamics between layers and between different instruments (including the effect relative distance plays) is very much measureable, and I would say extremely relevant.
I agree with you completely. However, VSL's position was that natural-dynamics isn't even a sensible notion, and that people who even entertain the concept are irrational people lacking sense. When I want more insults and science-denial from developers, I'll consider buying these new strings.