What chance do mere pilots have of fully understanding it before they go to work today?
About the same chance as they have of fully understanding FADEC or the cabin pressurisation logic, but you're not calling for everyone to be grounded while they study those. All people need to know is how to work it, not how it works. If you work it wrong, like leaving a thrust lever in CLB, or mucking about with pressurisation controls, the results may well be unintentionally ugly. Thus it ever was with any aircraft.