Yes I think we are on the same page.
ADSB doesn’t require heading information other than to orient an IN display - if there is one.
mode C based TCAS is a whole other animal.
heading sensors, directional antennas on the top and bottom of the aircraft, baro alt etc.
In helicopters this is more complex for many reasons.
for example the belly mounted directional antennas are useless near the ground or water - where helicopters are more likely to be found. Hence the inhibiting close to the ground due to spurious reflections.
It was good technology for the day. It’s been superseded. I doubt anyone would argue that point. Fitment and usage though…