they did it simply to make the instrument sound more authentic which it certainly does. It is not done to make the instrument sound and play exactly like a guitar as that simply is imossible on any keyboard.There was no need for yamaha to model the instrument to the nth degree because it wold not have added any more realism to the listener. There are no actual hand slide visual movement as far as the listener is concerned and hey wont know what chord changes triggers a slide sound from which would not.All they know i that the hand slide "sounds " appropriate . Sometimes we are overly analytical in these matters. think back to the first tike you heard the T2 demos and at classical guitar....didnt it just blow you away ??? thats exactly what it does to your audience the first time they here it. To them your instrument is still a magic box of tricks that can emulate guitars, saxes etc.