The GP and Endo would have to apply themselves the same. The endo isn't learning something in medical school that the GP is not or vice versa, not when it comes to TRT. The false sense of security many have because it's an endo is just that, false. Don't misunderstand me, I'm not saying endos are bad, there are plenty of good ones. Although when it comes to TRT, there are more that are lacking than not.
The false senses of security we all tend to carry is strange when you think about it. I'm sure there are some that will only buy name brand commercial testosterone, despite the generic or compounded being made from the same powders that were obtained from the same place. Even OTC meds are this way - we can buy generic ibuprofen for nothing, yet most will stay pay the extra few bucks because the box says Motrin.