Any of the newer avionics would have had PFDs lit up like a Christmas tree in this situation with audio alerts to match - providing there was indeed ADSB out. It seems that there was at best only one ADSB out here and even that is unclear.
I’ve flown behind IN/OUT for years and can attest that it’s extremely accurate and very functional in busy class D airspace . It’ll happily paint a dozen targets at a time all within a mile.
no need to have you’re head in the cockpit. It just calls them out.
Given the amount of pushback from industry just to introduce OUT, itll be ages before we get an IN/OUT mandate.
Maybe this incident will slowly move the needle.