I have several thoughts on this, both as an experienced yo-yo dieter and now as a maintainer.
In the past I reached goal more than once on SBD and got lax on PH3 and started on a slippery slope, eating things I used to eat, gaining weight.
What I learned for myself over the years is:
Over time I do have more control over many foods and can actually handle some degree of moderation. What seems to work for me now, most of the time, is to continue PH2 at home and allow myself to go off plan for special events and eating out, which fortunately don't happen too often. I do feel often feel a bit like an addict at those times and rather overeat. Not always, but often. As long as I don't cheat or stay off plan before or after, I do okay long term.
I have also learned that, like an addict, there are some foods that I just cannot have in the house. Even some "healthy" and OP foods. Like crackers. Cereal. Interestingly enough, I know that with the overeaters anonymous program, which would be, of course, modeled after AA, you do totally abstain forever from certain foods that you have determined are your triggers.
But I also know found that for myself I can sometimes reintroduce a past problem food at a later date, after having gotten it out of my system and life for a while, and be fine with it in moderation. Peanut butter is an example for me. And bread was, until this past week. (That's another long post.)
After many years I have come to the realization that I do not have a normal relationship with food and probably never will. But I have been able to find a balance and a way to eat where I can, for the most part, both maintain my weight and feel good (physically and mentally).
Bottom-line - you will have to figure out what works for you. It may take time and there may be trial and error. Or it may be easy. You may find you do best to just not eat certain things. You may find that time on plan allows you to eventually eat things in moderation (which is what PH3 is intended to be). My advice is to go slowly. Be patient. Don't be scared - but a little caution is a good thing.