Peter R. wrote:
Ron Natalie wrote:

Yes, it is one of the few good things that can be said for
TCAS.

Why does this sound negative to me? Are there major disadvantages of TCAS
that outweigh the advantages (besides the cost)?

It wasn't the best solution at the time the FAA decided on it. It was
a result of heavily political (i.e., graft) influence. Of course, the
FAA has never had a sensible nor consistent story for automatic
collision avoidance (see the TCAS vs. TIS vs. ADS-B debacle).