yeah, exactly. Artists genres are weird and the algorithm uses a weighted system to determine the clusters. But you need to try a couple of different options to get what you want.

MusicBrainz and LastFM have much better genre information and on a track level, IIRC. Their APIs are free, I think. You could use them to look up genres.

yes will integrate more genres in the feature. especially apple music even have song genres, whereas spotify only has artist genres.