On the contrary, the way Amazon treats their employees does harm them substantially, they just haven't paid the price visibly to the public (or quite as hard as they will, eventually).

Attrition at Amazon is at horrific rates. I know the actual number, though I'm pretty sure that'd violate my NDA to reveal. It's high. It's really high. Guess a really truly terrible number. It's probably higher than that.

The stream of people leaving the company isn't a trickle as it is a well-managed places. It isn't even a modest stream. It's an outright deluge, particularly in this market where everyone else is desperate and willing to pay (protip: Amazon, as a rule, is not).

This is starting to show itself in many places in the company. In a lot of places there are no longer any senior engineers left who know how the system works. In their place are fresh-faced college grads struggling to contend with a system they neither have the experience nor the documentation to maintain, much less extend. The average tenure of the Amazon engineer is embarrassingly short, and coupled with the company's notorious lack of documentation, it means that technical debt is accumulating at an alarming rate.

There are constantly projects to completely revamp/redesign some portion of Amazon's systems. In my observation this is less about an honest improvement over the old system (sometimes there IS no improvement) but rather because nobody knows how the fuck the old thing works. The truly sad thing is, they have trouble keeping engineers around long enough to even see that redesign through.

If you know where to look on Amazon's site, you would see lots of evidence of this already. Extremely deep integration into systems that literally no one still with the company understands. Tons of mission critical code whose original author is long gone, no documentation exists, and in fact the code isn't owned by any team. I've seen many hacks to work around these problems, though I doubt they'd be super apparent to the common Amazon shopper.

The problem here, like many other companies in a similar stage, is that very little of Amazon's management has a technical background at this point. Bezos certainly does, and I still think he's one of the best CEOs in the industry right now, but many of his underlings... not so much. A lot of management do not see this accumulation of technical debt. Difficulties working with said debt is perceived as either "natural" difficulties of working with technology, or worse, incompetence. Amazon's internal existence is a depressing cycle of: hire people, people spend eons learning how the previous guys did it, people write code, people get fed up and leave, hire more people, people spend eons learning how the previous guys did it...

If any Amazonian management is reading, I have one thing I really want to drive home: stop being so fucking "frugal" with equipment. It is a travesty that my development desktop was a Celeron worth $300 on eBay. Not because I like having the newest shiny, because I couldn't even run multiple dev environments on it, like I had to for my JOB, and building my code took 12 full minutes, instead of, say, 3. Stop shitting on your devs with dinky 5 year-old monitors and give them some screen real estate. There are plenty of studies that outright prove the productivity boost that comes with bigger monitors.