The Emergency Airworthiness Directive issued after Lion Air 610 crash was, in summary, "Pilots, remember that there is a runaway stabilizer QRH response and pilots should follow that when indicated."
If you're arguing that the pilots didn't know about the possibility of runaway trim, I don't find that very likely. If you're arguing that they didn't specifically know that MCAS could cause runaway trim, I probably agree but think it's irrelevant as the response to runaway trim is not to diagnose or draw the system diagram of the fault, but rather to simply stop the fault, which the stock 737 checklist would have accomplished, if followed.
The Emergency Airworthiness Directive issued after Lion Air 610 crash was, in summary, "Pilots, remember that there is a runaway stabilizer QRH response and pilots should follow that when indicated."
If you're arguing that the pilots didn't know about the possibility of runaway trim, I don't find that very likely. If you're arguing that they didn't specifically know that MCAS could cause runaway trim, I probably agree but think it's irrelevant as the response to runaway trim is not to diagnose or draw the system diagram of the fault, but rather to simply stop the fault, which the stock 737 checklist would have accomplished, if followed.