Like I said, it's a specific personality type that fits in well here. If you just want a steady 9-5, go home, walk the dog, feed the kids type job, this is not it. A lot of people burn out because almost no one will ever tell you when you've done more than enough. There's definitely plenty of that relentless Amazon do-more culture at AR.
The 10% of individual contributors who are awful can generally be worked around. But if you get unlucky and get the 10% of management who are awful, your life can be hell, which I also lived through. Senior leadership pays lip service to employee concerns and dealing with bad managers because 1) employee relations is hard and 2) they have to fight their own political turf wars. There's also a lot of middle-aged men going through mid-life crises who make it our problem.
Speaking of which, if you end up caring too much about your work (which you tend to do if you fit in), the politics can be very draining. Some of that awful 10% are definitely high functioning sociopaths and egotistical blowhards who optimize for their own visibility. They love asking "gotcha" questions and pushing their own asinine ideas to show how smart they are. Amazon claims to be "data-driven" but you would be surprised how many ways nonsense can be construed as data.
There's also the control freaks, the incompetent managers who fail up, and so forth, but that's not really exceptional -- except recently there's a few in strategically important positions to maximize misery for their reports. Probably part of the high turn-over in the last year.