Why aren't there more series featuring yakuza women?
Yes, yes, she has her own board now, how clever.
there aren't that many yakuza men either
most times yakuza are brought on screen it's either a mook fight or a generic 'OH SHIT HES YAKUZA??' plot device used to acquire something or force characters to fake respect for a character without having the character actually do anything badass yet
In fiction they can be the boss.