tcas
In ordinary circumstances, TCAS can be very useful for awareness of other aircraft.
If pilots have their hands full controlling aircraft in severe conditions or possibly eyeball bounce, things become more difficult. I spent a lot of effort avoiding this stuff. Experienced plus and minus 3000 ft in turbulence and iceing with seriously impaired vision in an embedded CB in my early days. There was no such thing as TCAS, but if there had been, it would have been useless, due poor vision.