Most software developers have no concept of real world limitations and issues like tolerances, failure, probability, latency, hysteresis, ramp-up etc. because they're not engineers.

Normally they'd be expected to at least account for software-specific aspects like ACID or CAP or some vague awareness of the fact that when you're dealing with multiple systems the data may not always arrive as you expect it, when you expect it. But even that is a crapshoot.