I was on one of the core AWS teams. I lasted 3 years and 1 month, to your point hah. I left about a year ago. My stress levels were through the roof during the time I was there. It truly was one of the most toxic stressful places I've ever worked, second only to Intel.
The largest contributor of stress being on-call rotations where getting paged between 12am-6am each night was basically a guarantee. God help you if it was a holiday and you got a high sev page, where the people that you really need are all out of pocket. The many many many instances of their security "regime" relentlessly paging us in the middle of the night for things like having an S3 bucket for static website assets; despite numerous exceptions given by L7+ leadership.
I disagree with the notion around "short documents", not only were they quite lengthy at times, but they actually made the process of "busywork" worse by adding more overhead to trivial matters.
Add on the layoffs and "return to office" horse-shit excuses and it's no wonder nobody wants to go back.