I'm fully aware of what TCAS is PerPurumTonantes, its superb in a commercial environment within IFR. Its saved my bacon a few times flying down through say certain parts of Africa and a few other less well controlled parts of the planet in my day job - But my view is it has no place in GA.
I've found the Mk1 Eyeball system very reliable for GA VFR that requires zero investment and is by default carried on board every flying machine.
Somewhat prehistoric philosophy no? We don't need something because something we all ready got is adequate. Pretty odd at any time imo, even more so when the "thing" in question can help save lives?? I don't get it. But then again I don't really get a lot of things about GA.