This is my own speculation, but I am a musician who specializes in synthesis so...<p>The Karplus Strong technique, a method for simulating string tones, has been around for a long time, since the 80s or so. KarplusStr has done bowing surprisingly well for a while. Plucking, not so much.<p>Long attack with a short decay/release gives a very convincing bowing sound on nicer synths, but once you increase the attack to create plucking sounds, the synthetic nature of the tone becomes far more obvious.