But that's exactly what the vestibular sense does. Sound is a sense, right? Hairs catch vibrations, and transmit the information. The vestibular system also uses hairs, but instead of vibrational movement it transmits how the liquid moves around, by how it moves them when it does.
In fact, the vestibular system
does help us to perceive the world around us. Try to make it to the path that you managed to spot when it's hard to stay focused on it because of your movement disrupting your vision and also because you can't walk (much less stand) in a straight line. It plays a role with your sense of perception between where you are and how you move relevant to something else. (See why
here.)
Really. Without this sense our perception of the world would not be the same. It would effect our language because it'd make it harder to read; it'd effect what we're capable of doing because it'd be a challenge to stay upright, perhaps even on our hands and knees. Among many other things. It's simply an invaluable sense in and of itself, and our visual sense just wouldn't be as good without it.
It's fine to go without it when you're in space, though.
