Saifudeen (1019904)

Thats why there are always two pilots in the cockpit monitoring and crosschecking every single thing the aircraft does.

To give a proper reply to the questions asked, I will stick to what I know for a Fact and avoid commenting on everything else. The airbus family already incorporates TCAS AP/FD mode, i.e., at TCAS TA, AP will arm TCAS blue, and at TCAS RA will engage and manouver the aircraft as per TCAS advisory. and once out of RA, it will mode revert to basic AP/FD modes.