"the advice of an experienced medical professional over anecdotal evidence every time" is generally good practice. And if you have found a solution that works for you, great, stick with it, at least on long trips until you've found a better solution while closer to home.
But in defense of second opinions: Some medical issues (back- and foot problems high among them) are treated differently by different physicians. Because their training was different, because their professional experience with patients has been different, because their success rates differed, because they've read different journal articles, or just because. And I say that as someone who very much favors most western medicine (like my wife practices).
So (not to Heath who has a solution but) to others who may still be searching for a footwear solution: hiking boots generally don't provide ankle support. If they did, you could not move your ankle. Downhill ski boot provide ankle support, but you can't hike in them. At most, hiking boots provide some cushioning around the ankles and a bit of stiffness around the ankle joint, but those would be the logger-style boots that come to one's lower calf and who wants to hike in those? Like Dena, I injured my ankle and it was surprising and discouraging how long I had to not stress it to let it heal. Once healed, I didn't need "ankle support". I sprained it in the first place in heavy boots with mindless foot placement. Ever since, I've paid more attention to where I put my feet.
For me, (and YMMV), trail runners or low-cut trail hikers provide the stiffness in the sole that I need while minimizing the weight on my feet. "A pound on your feet is worth 7 pounds on your back" because you pick it up, accelerate it, de-accelerate it and lower it with every step. I like the minimalist trail shoes – "barefoot" models – for up to 10 miles a day for that reason – I'm lighter on my feet and have more energy. But for a full day of hiking, without any stiffness in the sole, my feet feel kind of beat up at the end of the day.
Aside: I use my "barefoot" very minimal shoes the most on business trips. They are so light and compact, I don't hesitate to throw them in the overnight bag and then I have something after I remove the business-dress loafers to walk 5 miles around town, go up and down the hotel fire-escape stairs, and use the exercise gear in the hotel gym.