Can't speak from knowledge about the pre-e but I can definitely assure you HRT does affect libido - in my case, tremendously! Since I started HRT:
1. My interest in sex has been severely reduced; I went from sex 1-2 day to 1-2 a week. I love it! It's not weird either, you just sort of stop thinking about it after a couple weeks of hrt.
2. Random erections have disappeared... completely! Morning and any other time

3. Here's the part your wife may not like (my gf just thinks it's funny), at about month four it starting becoming very difficult to achieve and maintain an erection. Basically, I can't just say hey let's do it, instead I have to be worked into it. Just like I hear most cis women are.
4. Best part for you, at about month 5 now and there is no more ejaculation! I also find that I can continue after climaxing.
Lastly, again maybe bad for wife, everything has gotten smaller down there. My gf jokes that it's dying.
Sorry if TMI, just wanted to share my personal experience.