Good point and you would think so. But I and many others who have taken DHT lowering drugs have suffered feminising side effects. It didn't seem much initially, but over the years the cumulative effect have had a major impact upon my physique. For example I was holding fat more fat around my lower body and parts of my chest. Even when I tried low car and low cal I couldn't get as lean as I used when training less intense and with more cals. I thought it could be lower DHT, but then I took a DHT derivative and the moderate increase in DHT had a massive impact on my body. I was holding far less water, eating twice as my cals, no cardio and I was still leaning out brilliantly. It seems DHT is far more androgenic, responsible for the masculine effect in men, than testosterone. I then I went onto find this.....
Another good choice for an anti-androgen is finasteride (Proscar, Propecia), and is able to be used in concert with spironolactone. The primary use of Proscar (finasteride 5 mg) was in the treatment of benign prostatic enlargement, but with its reintroduction as Propecia (finasteride 1 mg), the drug is being largely marketed to promote scalp hair growth. For transgendered women, finasteride when given in the larger dose promotes not only scalp hair growth but acts as an potent anti-androgen as it is highly effective in inhibiting the conversion of testosterone to DHT (dehydrotestosterone) responsible for male sexual characteristics. Finasteride is usually physically well tolerated over long durations.