Since low T in hypogonadic men is either primary (failure of the testes) or secondary (problem in the Hypothalmic-pituitary-testicular axis) wherein the body's hormonal feedback loop is broken, I am wondering if the varying types and subtypes are more or less difficult to address.

More specifically, what is easier to repair or address, primary or secondary?

With respect to secondary, what is possible to repair/restart and what is not? For example, if the Hypothalmus is determined to be the problem is is easier to deal with it than, say, a pituitary problem? In other words, are some defects fixable and others less so? Do some respond more or less favorably to treatment than others?

I have no answers here--just seeking them.