Yes, it's not really the testosterone that causes hair loss, it's the DHT the testosterone is converted too and there are drugs and topical foams that can prevent that conversion from happening in the scalp. There are other medications and treatments that work differently as well. It's a complicated topic. Also some people just aren't very susceptible to hair loss.

Not really, finasteride with steroids will spike your estrogen and cause you to get permanent manboobs and other sexual issues IIRC, and if you use yet another drug to block this estrogen conversion it's even more dangerous.