I sit in a lot of doctor training sessions and the feelings on hrt have changed a lot in the last 5-10 years. It’s now well thought of and an acceptable risk. Apparently the quality of life improvement is huge compared to the relatively minor risk
Not a comment on the parent post, just highlighting that biology is not so straight forward.
But once cancer has occurred, adding more testosterone doesn't matter because the sponge is already super-saturated.
In fact, doctors who have this perspective will permit men with prostate cancer to continue testosterone therapy.
Of course there are many types of cancer so this may not be true for all prostate cancers.