To bring it back to the OP, and the pros and cons of surgery... I feel like this is quite similar to the knee issues. There are tendons involved, and bone, and the traditional surgery, which is open surgery, has so many possibilities for complications, while the newer, minimally invasive surgical option is controversial and has fewer skilled/experienced practitioners...
I don't know if there are longitudinal studies (like 10 years post-op) of this surgery (I have looked before and will do so again) but I wouldn't be surprised if the findings turn out to be similar to the knee surgery findings.
Tendons heal very slowly. But the standard medical guidance is surgery if conservative measures don't show results after 6 months. If tendons heal so slowly, why wouldn't it take longer than 6 months?
Right now, I can walk. If I have the surgery, I won't be able to walk for probably 6 months. So why hurry?
So my current approach is to change the angle of my heel (with footwear and heel raises) to move the bone and enthesophyte away from the achilles tendon, while also doing specific kinds of PT, and see if I can get better without the surgery. (oh and by the way, this is why footwear is so important to me!)
My last MRI was in May, so I'm going to ask for another MRI in next spring.