TCAS and HISL and EYES and EARS are the aids we can use to avoid collision. It is my opinion that all the observations made previously are valid points and we all can fall into the trap of watching the instruments at the expense of 'LOOKOUT'. TCAS is a super tool with limitations. If I were an ATC controller I would be very worried about a pilot who gave a report related to what is seen on the TCAS, wouldn't you!