It's really hard to envision exactly all the problems parallellization might enable in a given system, as it'll all depend on exact implementation and execution

It's really hard to envision exactly all the problems parallellization might enable in a given system, as it'll all depend on exact implementation and execution details. The safe assumption is whenever you introduce concurrency or even event-handling, stuff might implicitly FUBAR, unless explicitly designed not to. This is a tough pill to swallow when people can't envision exactly all the problems parallellization might enable in a given system (circular argument).