This all depends on product requirements. But the single simplest reason for choosing a cloud provider like AWS is reliability. If a region or machine goes down

This all depends on product requirements. But the single simplest reason for choosing a cloud provider like AWS is reliability. If a region or machine goes down, how do you handle it? AWS has the best reliability among cloud providers, so by choosing them, the odds you even need to think about it are minimized. And they have answers to multi-AZ and regions. But if a few mins of downtime every few months isn’t the end if the world, by all means save yourself the trouble until it is.