Yeah I get your point Bingo, but that was always the innocence and beauty of Star Wars for me. How the hell can a droid have a personality? Was R2 the product of a communion between 2 consenting R units and from a little R2 grew into the R2 we've come to know and love? His personality grew with age? He just is what he is (same with Threepio) A droid with personality, and that's accepted without question because its fantasy. It isn't delved into on a deeper level because there simply is no need for it to be.