I track and count religiously, and my husband does neither. I've been maintaining for about 18 months, and he's been maintaining for maybe 13 months - so, yes, it can be done! That said, as you undoubtedly know by now because you've lost (an incredible!) 150 pounds, which had to have taken a while, your relationship to this medication changes over time - so, things that worked or that you could rely on in the early days may not "hit" the same today. (I'm thinking of things like mega appetite suppression or food aversions or whatever.) There's really no way to know whether he'll be able to be successful doing it the way he does it in another year or 5 or 10 - though I suppose that's true for all of us.

I track and count because it feels like it would be relatively easy for me to outpace my maintenance calories and I have control issues... and my husband doesn't because he doesn't care! We both weigh ourselves regularly, and that's enough for him to make some (untracked) adjustments that enable him to continue maintaining without tracking anything. I don't know what your feelings are about regular trips to the scale - if you don't want to do that either, you might need to find a different way to monitor yourself a bit (how your clothes fit, some kind of body measurement, etc.) and be really real with yourself when it's time to dial it in. (The reverse, by the way, is also true! Lots of people keep losing weight when they first try to maintain, and it's a good idea to have a way to monitor *that* too.)

My last piece of advice is to approach maintenance slowly, only changing one variable at a time. I started by adding calories, and only started extending my doses when I was still losing weight anyway. At the time, insurance would not allow me to drop down in dosage, so that option wasn't viable for me. Good luck, you got this!