[aeonfox]

True. And that the subtle bugs were then picked up by static analysis makes the safety proposition of Erlang even better.

> Bugs that happen regularly in prod

It depends on how regular and reproducible they are. Timing bugs are notoriously difficult to pin down. Pair that with let-it-crash philosophy, and it's maybe not worth tracking down. OTOH, Erlang has been used for critical systems for a very long time – plenty long enough for such bugs to be tracked down if they posed real problems in practice.