They were times when people used to manage their servers and they had to be careful on how to use 'rm -rf' or 'dd' tools.

I find it funny how today there have to be red flags, warning signs and double confirmations everywhere. Are people less competent or are there simply lower requirements when hiring them?

Not if you use aws-cli. But I think the larger issue is that Amazon doesn't provide a low-friction, secure way for applications to access their buckets. A good way would be for each bucket to come with its own access key, or expiring tokens that you could query on the backend and use from the browser. Just spitballing of course.