Exactly. This is an argument I've made multiple times. Reptiles can feel pain, but certainly not in the way that mammals do. If they did, it be very detrimental to them. If they were overcome with pain from a wound in the wild, they would be less likely to escape to a safe place.

It takes a much higher dose of anesthesia to work on a reptile as it does to work on a mammal. It also takes much longer for reptiles to cone out of anesthesia once under. It also affects their internal organs and functions in a different way than it does with mammals.

Some reptiles release a chemical inside their body when under stress that can kill them. This effect can be increased with the use of anesthesia.

Remember Steve Irwin? He constantly talked about this. They never used anesthesia on their crocs. It was safer and less stressful this way. Just secure their legs and mouth, and cover their eyes.