I'm not ross, but I will express my humble attempt at an educated answer:
All those compounds are suppressive. So in essence you shut down natural test production, and don't supplement with outside sources of it during that time.
It's like your boss firing you, but saying "its ok bro, i'll give you 5000$ a week untill I hire you back"
Now by using compounds that are suppresive, without the test, its like your boss firing you but not offering to give you ANYTHING. So you get kicked out, no "normal" income, and it isn't replaced with anything else.
Again this is simply my humble attempt at a response