Well, 95%+ of man's testosterone is produced in the nutsack. Remove it and, over time, the man will lose bone density, good amount of muscle mass, the important male muscle-brain-mental health connection would deteriorate, develop serious metabolic issues, become at risk of shit like Alzheimer's probably die significantly sooner as a result of the missing hormone... People don't know how important that is. What is the brain worth in a failing system?
Meanwhile women, produce roughly 25% in ovaries, 25% in adrenal glands and 50% is converted in adipose tissue. After menopause ovaries significantly reduce that production, which why everything goes haywire.