The problem with a safety system is that you don't know how many accidents it has prevented. Without that proof it's easy to decide, like our 747 Classic weight and balance indicator, that it is not necessary and save on maintenance costs.
Having said that, would anyone argue for the removal of TCAS or GPWS?
What if Airbus fitted a sidestick position indicator which could be seen by both pilots - and a captain standing behind the seats? (or moved the poles to the front of each pilot)