Earlier quoted context omitted.
Definitely because it was faster. Amazon's strategy is to launch new features ASAP and then rely on everyone having to be on-call to fix shit when it inevitably breaks in prod because they rushed to launch. I will admit that while their "operational excellence" is shit, the security engineers do have quite a bit of power to block launches so their security isn't as bad as the reliability. However, the fact that write…
I was there for the launch of a major AWS service where they had an entire separate team working on the next iteration since well before launch (because the initial design wasn’t even intended to be sustainable). They are happy to incur technical risk (and in this case, to eat major losses in hardware costs) in order to be first to market.
If only they had a competitor that could launch the same products a few months later but offered higher reliability off the bat, that could eventually force Amazon to improve their reliability or risk losing customers long term.
Being first to market doesn't ensure eventual market dominance. Sure, it could give you important feedback. But if your product is subpar, the feedback will have a ton of noise and possibly be useless. Plus it's not worth creating negative externalities and earning the reputation.