Part of the problem with TRT is the definition of low tester one is somewhat nebulous. I am not sure there has been a lab range accepted age-adjusted testosterone levels. Typically the most commonly accepted medical reason is when a man comes in with a non-typical fracture (hip, vertebral body etc...) then we tend to look at testosterone levels.
Other than that...indications for use are sketchy.
In addition, anyone who has been around and doesn't have an agenda or bias would be wise to remember the fiasco with ERT in women. Made them feel good, but ended up being more harm than benefit. It is likely, outside of a few indications, that TRT will end up being the same.