I don't comment much about these mid airs and other tragedies, I kinda keep it to myself. I do feel for all involved even though I don't comment and wish well for the recovery of those involved.
We've all got the stories of the close calls and the shoulda, coulda, it almost happened to me

I too use a Xoan PCAS and have had it work and not work. Last year in the Utah back country while flying the poker run it worked, very surprised. And I have watched it not work as a V tailed Beech passed 75' below me (I saw him about 2 seconds out) on a course that would have been sure death had either one of us been higher or lower in a strong radar environment.
When it's your time no mater how vigilant we are it will happen (if it's your time), our job when flying is to do our best to not let it happen. I've flown with people and got some nice compliments about my abilities and come back with a thank you, but I tell them I may be good but I don't assume that bad things sometimes happen and there have been much better men before me that have met a tragic end not because they were not a better pilot but because they were in the wrong place at the wrong time.
So my heart goes out to all those in the past and future that have met an untimely end doing what we all love so dearly, fly safe my friends, may your families have you for many more years.