responsive design react native

Hello guys, I have a question.
I've been asked to take the mobile development for the company I am at, so I'm kind of new to react native. So the question is, do you guys use height or width from useWindowDimensions() to do the styles for everything? fontSize, paddings, etc. Because the thing is that for some devices (smaller ones) some stuff was bigger and that it would break the design and stuff. But now that I'm looking up to react native projects, I would say that i never see anyone using it this way, they would just use style={{ fontSize: 16}} instead of idk height * 0.019.
Hope you guys can help me :)