Hmm, grasslands typically haveong grass and the horns just give them a "unique spacial awareness" so to me thats more like, for lack of a better term, "spidy sence". That could be exclusive for hunting, interfere with the function of others, or work in a completely inconceivable way that the devs have to explain.

And since it was mentioned about large builds sucking at steppe topography, it strikes me that they could in fact be simmiler to lions. Females using their leane and leathal form to hunt while the more hulking males defend the home teratory.

Then assuming the horns grant a certain level of esp then they are 100% practical for hunting prey AND the anti-stealth sencory to prevent the camp from being ambushed.

(Also let's stop using fringe and psudo biology on a game where we have fish people, carnivorous plants, and sentient rock creatures. None of it truly applies in a fictional " Magic trumps Logic " based universe.)