I agree, but I see the reasoning. MCAS failure leads to runaway trim for which there is an established and well known procedure to fix--in the checklist almost 50 years. For a problem with trim you flip the trim cutout switch. Doesn't matter if the problem stems from MCAS, autopilot, crossed wires, the magentic pole flipping, jammed electric motor, whatever.
It's like explaining to a computer user that rebooting will fix aproblem--they don't need to know the exact cause but just how to recover from it.
