It is likely that this RCA was shallow because it was intended for everyone--including non-technical users, who (at least in my experience) tend to misinterpret or get confused by deep technical or systemic failure analysis.

It would be excellent if Stripe published a truly technical RCA, perhaps for distribution via their tech blog, so that folks like us could get a more complete understanding and what-not-to-do lesson (if the failing systems were based on non-proprietary technologies, that is).