Some times I wonder how peoples brains work. We have a discussion on two/three pointer altimeters and the jist seems to be that it is the three pointer altimeter that can instigate erronious readings.
I'm not seeing this as a 2pointer v 3pointer discussion.
It would seem that investigations, both following accidents and in research discovered that the 3 pointer, in solving one issue, caused it's own problems. It was not, in practice, intuitive to read.
People's brains don't always work as the experts predict.
By the time of the Britannia, SE210, and 727 crashes referenced in this thread the alternative was presumably the drum or odometer type rather than reversion to the two pointer.