I don't think that D&D is western style medieval fantasy at all, if by western fantasy you mean the tradition of fantasy that stems from western myths and works its way up to the present.
D&D is modern RPG style fantasy. Always has been, always will be. Its genre is an invention of the 20th century, and there are living people who are older than it is.
D&D is modern RPG style fantasy. Always has been, always will be. Its genre is an invention of the 20th century, and there are living people who are older than it is.