It is sad, but this is also because of the generally low level of interest in classical music.
I will say that even within classical music, he does not get the correct level of recognition. Possibly (likely) due to racial issues of the time.
I have noticed more is being done to address this recently, which is a positive. Classical radio stations are featuring his music more and running features discussing his life and music. He was also featured in this year’s proms, which is probably most of the general publics only exposure to classical music.