That’s called the Argument from silence .
The point Jimbob was making pretty effectively is that breast augmentation is mainstream. Even with that there are problems but they are mostly supply chain e.g. substandard implants that leech or cut price clinics. You can go to places you’ve heard of for breast enlargement. Penis enlargement is a different matter.
You could argue that length surgery (cutting the ligaments) is relatively safe and maybe close to the risk levels of breast augmentation but after length surgery, you have to use a hanger, why not just skip out the surgery and maybe put in a little more time with the hanger? Even then there is at least one case detailed here where length augmentation surgery resulted in a length decrease.
Girth surgery is different. It’s in flux. The area is far more complicated than the breast with closely packed nerves and the surgery itself is quite invasive. Various types of implant have been used, there’s no standardisation, no best practise. It’s maybe even questionable whether an implant over the CC rather than a method to expand the CCs is a good idea.
Being a guinea pig has the advantage that you are at the head of the queue if things work out but it also has a large downside.