When farming for the Access key in Dannah I was left with enough items for the Ghost shirt, by level 11 though a basic free-fire bullet does more damage than that shirt can heal, so your better off topless Panacea can be a little useful if you get it early, but as it happens so infrequently, it isn't really
You know, I've had quite the opposite experience with these items. I remember one time in particular I was fighting a large group of gang members on a rooftop in Westview. I was getting hit by enough free fire that my coat was constantly activating, it kept me in good enough health that I was able to take out everyone and get the key I was looking for even though outnumbered by reasonably strong goons. Granted these are below par for higher level operatives but between say 15 and 25 they can really make a difference. I see though that Panacea is level 30 and at that level I'd expect a bit more than that small chance to heal. If you ask me, it'd be a good idea for the Devs to review our Collector gear the same way our Hideout Loot just got reviewed.