This is grossly overstating the optional feature. As I understand it, "AOA disagree" is a single light near the AoA indicator itself. It's not an explanation, or even an alert. It's not where anyone would reasonably look when trying to diagnose an uncommanded flight control problem.

When lights are normally not lit and one lights up a pilot or other machine or plant operator should take notice.

A detailed explanation should not be required since they should know what the different warning lights mean and what can cause them to be lit.

I personally would like to see a list of the airlines that bought the more expensive 737 max that included the additional safety features.

The North American airlines bought it and no others did. It was not described as a safety feature -- if it was it wouldn't be permissible to make it optional.

Even the current training does not tell pilots to know that an AoA disagree light is an emergency because it can cause the plane to enter an uncommanded nosedive via MCAS. I really don't think it's reasonable to expect the pilots to know things that Boeing is not even trying to tell them.

> When lights are normally not lit and one lights up a pilot or other machine or plant operator should take notice.

The crew monitor the central EICAS display for fault indications, not random locations around the cockpit.

If you start bolting-on additional check locations you increase crew workload, particularly if it's not a 'dark cockpit' like an Airbus type.

Yeah, maybe it shouldn't be an extra.

The Ethiopian plane was new and this was still a problem.