I'm glad you resurrected this thread! I've been wondering the same thing, to be honest.
So, my end desire is to transition fully, but there's been many times where I thought to myself, "If I could just get rid of that thing, I'd be so much happier." That, and all the hair all over my body!!!
Not go get too deep in the NSFW territory, but, on top of feeling like it shouldn't be there, I also have a desire to be with men intimately. And, although I do feel a desire for penetration, I have NO desire for using the backdoor, if you catch my meaning.
So these are two reasons that are important to me, and why I ultimately feel like SRS is the most necessary thing.