I also had the pleasure of Mike's company for FI course and renewals over the years.
Great guy.
Tcas 1 does not give resolution advice, that's Tcas 2 that must be followed.
A good lookout is always the number 1 but a form of tcas will inevitably give better SA.
For those people insisting that it will force people's heads inside the cockpit, well yes there is that argument and in some cases this will happen but then so does GPS. I fly aircraft with and without Tcas and I feel far more comfortable in a tcas aircraft.
RIP Mike.