i don't understand why "intelligence"/"smart" is a good thing to optimise/aim for: 1. it's not a well defined quantity. 2. under any definition, it doesn't se

i don't understand why "intelligence"/"smart" is a good thing to optimise/aim for: 1. it's not a well defined quantity. 2. under any definition, it doesn't seem to be anything useful in itself. can some entity create an entity better at a task that the creator? obviously yes. c.f., compilers, factories, cranes, &c.