I had fairly noticeable arm hair that didn't respond much to HRT. I still use a combination of epliation and shaving to keep it from being apparent, but I've also been working on permanently removing it with DIY electrolysis. It's a very slow and painful process, but it's getting the job done. One thing I have noticed though, it that a lot of women you see do have noticeable arm hair, and some even have pretty dark arm hair if you look closely. Probably a lot more women who don't have apparent arm hair are doing something to get rid of it. I almost feel like complete lack of arm hair is in and of itself something that people might see as being weird or unusual if they noticed it.