Also Southwest certainly did not have all of the indicators at first, because they added some: https://theaircurrent.com/aviation-safety/southwest-airlines... (note that pretty much nobody used that kind of indicator before, so I don't say that to put blame on Southwest)

It was also my understanding that some alarms including the AoA disagree were optional and for a fee even though probably activated by only needing to switch a bit somewhere in the software. So if Southwest had AoA disagree from the beginning (I don't know), well that's cool, but my interpretation is more like: that's not cool that some other airlines did not have it because of the dubious commercial practices of Boeing.

The design redundancy was the pilot in the loop - ie, in a stab trim situation pilot would follow a memory item. So this meant much less automation protection compared to systems without pilot in loop.