Everyone _says_ they want choices, but to a first approximation the number of people who change the defaults in any computer program is so close to zero that if the numbers were the only thing that mattered, user choice - provably, measurably - would not matter. But it does matter.
Furthermore: if people depend on your product - not just use but _depend_ on it - then you need to know how that product operates or fails in real-world use.