Well, it's understandable, I remember being like that before treatment.
I don't think it's "mandatory" so much as it is recommended. TRT is a life long thing, and hCG mono may very well demonstrate the need for it, or it may work.
Either way, you can't lose.
In my case, I had years of testicular issues, including a surgery, as well as epididymitis several times, so it wasn't surprising to any of the medical staff why I was primary.
I remember starting TRT, and being upset that at 5 weeks my levels were PERFECT but I felt nothing. I was put on a protocol that worked the first time, no dialing in, all levels were EXACTLY where we want them but it still took 2 months for me to notice anything.
That's because hormones work at arctic glacier speeds. So 1 month isn't even enough to see the full benefits of TRT.