Hi Chelsea,
No offence taken at all. Nobody here is judging you. It is your life and we all love you for who you are. Personally, I have no use for that thing but you are your own person and have your own requirements. The comments you got on Facebook are not from people I would call friends.
As for your question about function, we are all different and proper medical advice is the best option. I have read reports from people that they have maintained function many years after HRT. Some have said they need a little extra help from a different kind of blue pill, like viagra, but aside from that everything still works. If you are considering children, then freezing some sperm may be something for you to look into sooner rather than later.
Good luck with this part of your journey.
Oh, and congratulations on the male fail comments from your niece. It feels nice, doesn't it!
Hugs,
Jayne