Actually, TCAS does NOT provide RAs or TAs below certain pre-determined levels (so is less effective in terminal areas.)
Also, whilst TCAS will provide a one-way RA between a TCAs equipped aircraft and a TXP-C equipped aircraft, it is much more effective between TWO TCAS equipped aircraft as it gives them both complimentery RAs. Indeed, one aircraft manaeuvering in response to an RA whilst another tries to do so visually or in response to an ATC instruction completely negates the effectivness of the system.
Conclusion?
If Mr Smith is true to his ideals, he should be advocating the fittment, use, and training of TCAS to ALL Australian aircraft and ALL Australian pilots.
Or does cost actually play a part in the real world.....