And VSL has accomodated their version of the new player interface thats yet to be had. Which will in effect provide more for articulation and playing enhancment, and or questions. Of-course that speaks for all music not just string quartets.
I am sure that VSL will do their best on the top level of the art.
But my original claim was that it is not possible to choose e.g when the string instrument play cis or dis. It should be freely selectable for all notes. That is not possible at the moment for any system, not even for VSL. That is the main reason that software instruments can't emulate string quartet playing. Articulation and style matters are, of course, also important but that was not my point this time.