Any string library you buy is going to have a different timbre, even the different string offerings from Spitfire have a different sound from one to the next.As someone who is heavily invested in spitfire, this kind of answers my former question. That's what i thought i heard while listening to the demos. It's something inherent in the timbre itself and not just the space each library was recorded in.
I do see what you're saying though. Some strings can sound radically different than others, which can make the task of blending a challenging one.
With that said, i think it's good to have different types of strings for different types of writing, and I think that's where people will get the most value from Afflatus.