Because VSL raised the bar so high, it actually ended up doing something that old samples libraries did, but with far more advanced instruments.
This is the old pp vs. ff contrast., which is heard in Siedlaczek to an egregious degree. There is no middle. And yet the middle is the most commonly used sound. This has happened in VSL because of the legato instruments, which are nightmarishly hard to record, but are so far represented in the strings only by a relatively dry p, and a very strong ff. So I feel, as has already been stated, that this mp middle layer of legato, especially with portamento, is crucially important.
it is interesting how the old Miroslav library had a lot of mp or middle dynamic samples, and as a result is STILL BEING USED even though it is a Pre-Cambrian Period sample library.
And what is the most incredibly useful sample the VSL has yet created? Some argument there obviously, but perhaps the mp legato horns. Another MIDDLE DYNAMIC.
Essential! But still non-existent in VSL strings legato.
(Though of course we have to realize they have their hands full, sampling everything in orchestral creation! But the problem is they have created Frankenstein monsters in their customers, demanding MORE AND MORE...)