Iirc its PCOS, which almost every woman nowadays has. There are ways of managing the pain effectively such as lifestyle changes and medication.
Different strokes for different folks. Some people are not into Hidori, even if they're guys. They prefer different body types etc etc.
Also, unless you know something about the inside of Hidoris vagina that the rest of us dont, I'm gonna have to doubt the other part of your statement too. Exterior Vagina size/appearance has nothing to do with internal size. The vaginal canal can stretch to about a max of 8 inches when they are aroused, and this isn't in all women either, only in some. However, that doesn't mean that big dicks don't hurt, especially if you have little to no experience with them and if you try to fit the whole thing in.
Hitting the cervix is a very old fetish-ised/hentai-rised thing, its actually painful from what some women say, and not enjoyable at all. There's actually a thread that actually shows this in action
https://simpcityopen.com/threads/70078/
The ones that do like it have gotten used to the pain because they're size queens/porn stars, have larger than normal vaginal canals or are lying.