Contemporary music: challenges?

When most people see a modern composition which is written in an unusual manner, they get confused because they're not used to that "language". This could be happening because string players become used to certain patterns which are learned while practicing "golden repertoire".For me, since I started playing modern music, it wasn't difficult at all. Maybe it's due to the way my brain works. Or is it a quick reaction where eyes transmit visual image of the score to the brain and fingers. Does contemporary music performance, require perfect technique, good working brain or loads of practice?