I have to disagree from personal experience... Also, I suspect your premise is backwards.
The first time I managed to get my symptoms under control I didn't have anything in my life, really.
During those 5 years of chaos, the first time my PTSD was in full hard swing, I'd had innumerable good things in my life. They didn't make me better. Sometimes, some of them may have masked my symptoms for a little while, but it was at best short lived. I was pretty intent on destroying anything good in my life at the time, but more often I couldn't even recognize them as good things.
It wasn't like a switch. I didn't get better overnight. And there wasn't a "rock bottom", in my story, although some people do get to one... I'm perfectly happy to drag face first through coral for the duration, apparently. Got a shovel? I can dig. Instead, it was a gradual easing. An uphill climb with many, many plateaus. Until I found myself, one day, essentially myself. Days, weeks, and months passed without panic attacks, or nightmares, or flashbacks, or anything else. I wasn't numbing myself, or self medicating, or self destructing. I was me, sans all the bullshit.
I also happened to be at loose ends, and had been for several months. No job. No relationship. No home. Not even any friends. None of the hallmarks of success or happiness. But for the first time, in a very long time (5-7 years) I was okay. And had been for a little while. It lasted a little over 10 years.
I've also been in this latest tailspin, started it 3 years ago, with my life full of good things and promise. I had a very amazing chance at life spread out before me. And I systematically lost it, in spite of it. Have come damn close over these 3 years of losing everything.
Why I suspect your premise is backwards? Is because both in my experience and observation, while we might want something good in our lives, until we're healthy enough? We can't keep those things. At least not easily. Some do (shout out to all the supporters out there!), I know I didn't. We sabotage, and self destruct, and struggle. It's not that having good things in our lives allows is to recover. It's that recovering allows us to have good things in our lives. To find (and hold onto) love, careers, homes, lives, interests, friends, etc.