The people who formed these 'rules' were not dimwits. There was a certain deep knowledge that has given rise to such rules...
Do you know that in Raga BHAIRAV, the second note of the scale is meant to be rendered in a CERTAIN way? It's called 'andolan'...it MAY roughly translate to a guitar vibrato...experts, correct me if I am wrong :
Breaking a certain rule in music only makes sense if you KNOW the rule in the first place!