Two simple facts. (1) When you administer TRT, you shut down the HPTA. This ceases LH production, and alters downstream hormones (2) There are LH receptors all over the body. They would not be there were there not good reasons.
My clinical strategy has always been to normalize the pathways as much as possible. Indeed, were everything running smoothly, the patient would not be seeing me. Restoring the system to a more natural balance is one of the benefits of regular, low-dose HCG administration.