In some games like the Witcher and Mass effect the choices you make can carry over into the next game. I believe if the save data isn't available you can tell the game which decisions you made rather than it porting them over.
Your choices mean little in BoTW because there is only one way the narrative goes. There is no different outcomes for each race and region so I don't see the point in porting save data.
At most it'd probably be some early game thank-you item for having save data.