Lol it's not taboo just a worn out topic ....the way I can see it thins hair is because AI's up your normal testosterone levels by stopping Test converting into estrogen...with more Testosterone more of it can convert to DHT...more DHT equals hairloss if your prone.
Personally I'm very prone to hairloss, although I've now run aromisan for 3months at a time with no loss, Aromisan blocks estrogen by around 85%, not as good as Letro but still by a large amount...I personally havn't suffered any loss while running an Aromatase inhibitor (AI) and in reality the real harm will be done by the steroids in your cycle not by letro...you may have thought the letro caused it but if you look at the growth cycle of a hair follicle then you will see the damage done during your cycle months after and this is probably when you were using letro....
If your going to run AI's... and your prone to hairloss then you could run finasteride/dutasteride/Nizoral