It can be. You could totally just get by on the vibe of being a Minotaur.
Background, Culture, Species, all of it could be window dressing, and its totally valid.
However, if we are coming into this with any kind of history of what Fantasy is, we go.. 'Wait, I'm a Minotaur? Dont I have massive Horns? Am I not a jacked bull man?!? Why is it little Timmy the Halfling can headbutt someone for the same damage as me??'
Vibes can get you pretty far, but even in something as stripped down as Shadowdark, I want a nod to the fact that 'hey, you got massive horns dude, go ram something'.