[Question] For what do we need Superintelligent AI?

Most of hu­man prob­lems could be solved by hu­mans or slightly above hu­man AIs. Which prac­ti­cally use­ful tasks – which we could define now – re­quire very high level of su­per­in­tel­li­gence? I see two main such tasks:

1) Preven­tion of the cre­ation of other po­ten­tially dan­ger­ous su­per­in­tel­li­gences.

2) Solv­ing the task of in­definite life ex­ten­sion, which in­clude solv­ing ag­ing and up­load­ing.

I could imag­ine other tasks, like near-light-speed space travel, but they are nei­ther ur­gent nor nec­es­sary.

For which other tasks do we need su­per­in­tel­li­gence?