I can personally point to two friends who I consider top notch engineers and designers that have left Amazon because of its toxic culture. I'm sure I'm not the only with these anecdotal examples, we've all heard the stories. At the end of the day years of unbalanced work/life balance, overly aggressive management and frugal approach to everything makes for a weak argument for A players to stick around.
Could this be an example of crumbling engineering standard at Amazon?