Yes, Bismillah Khan is important, not just because he was extremely talented with the shehnai, but also because he was the first artist that started to use the instrument in everyday music. Before it was only used for religious processions.
He was also inspired by the nature in India. He is said to have been in love with the Ganges river. It inspired him to play the shehnai the way that he did. It was also the reason why he never wanted to live anywhere else. He felt that if he was away from India, he would lose his inspiration to make music.