"interesting to get your thoughts on the NTSB report - about post 26 in this thread"
My opinion as requested:
the TCAS worked for the pilot who had it. He got an audible warning and this might have saved the day had he then been able to visually locate the traffic and maneuver accordingly. Seems it was the subsequent use of the eyeballs in locating the conflicting traffic that proved "inadequate".
I would have this one down as a near-TCAS-save.
At 275 kt closing speed the eyeball is woefully inadequate.
IMHO TCAS is useless without lookout but the corollary is also true, lookout is vastly better when augmented with TCAS.
SB