ADSB rocks. But -
The other day I was on a 'air highway' and on my ADSB-IN on the tablet, I saw another aircraft flying right down my throat at same altitude 10nm ahead, they were flying the wrong hemispherical, I called them on centre (where they should have been) , no response, so I called them on the last CTAF I guessed they'd been on, contact established, and they descended . System works.
HOWEVER, after the electronics did the job for me , as I was patting myself on the back for that, and thinking I just had to land in these windy condix, nothing else to worry about,
I remarked,. to myself, as I joined circuit not to forget that there are plenty of aircraft still without ADSB, so not to get too fixated on the tablet for traffic. Sure enough, two aircraft coming into circuit just behind me , neither with ADSB.
But, more and more aircraft are joining the club daily, it seems.