Q: Why does this matter?
A: It doesn’t.
It certainly doesn’t help. Grad school admissions are based on technical competence, not breadth in other, unrelated fields.
You haven’t even selected an undergraduate school (or major) yet. It is far too early to be making plans for grad school, let alone picking out specific grad programs.
Ultimately, credentials don’t me diddly when predicting success in forming a startup. What matters is having a good idea, having the people skills to sell that idea, and having the technical competence to execute on that idea.