You can have authority while still having someone be accountable to the org. We had a situation where we were paying for three different presentation tools and

You can have authority while still having someone be accountable to the org. We had a situation where we were paying for three different presentation tools and two whiteboarding tools for a team of 30 people because two people had minor preferences. I have to request a limited card for recurring spends, which comes with a "why" box. It makes people think about what they're buying just a tiny bit more. But I've never had a single purchase denied (other than the time I accidentally paid for a personal holiday on my work card because Google pay's default payment card on device and online are linked)