Excellent points and JK could have built the H&G relationship possibilities further. Then you need to look at R&H. They never got along at first. He hated her in a young age, then she was frustated by him in later books. That can be the early signs of attraction. Then take Hermione's character. She had many of the things that made her much like Ron's mom. She was a strong female figure, very capable in magic, as well a getting into knitting and nurturing of the group. She was the main supplier of food, then cooked it, for them while on the run. Those all made her very attractive to Ron. On the other side, we don't see much of her father's traits. One could assume her father ("typical" dentist) might have had similar characteristics. He was fumbling, socially inept, but with a lot of loyalty. In later years he grew tall, gained a substantial character, and supported her. All those could be what she was interested in. As for H&G, Harry *really* desired to be a closer part of the Weasley family lifestyle. Ginny was attracted to Harry from her first glimpse and did all the fumbling stuff young people sometimes do. Stammering and putting you elbow in the butter is cute. Dating others to "gain experience" is another. Hermioned encouraged this, knowing of Ginny's feelings, which might have steered her away from her own affection to Harry. When Harry took the elixer that opened him up to his attraction for her and may have altered his attraction further. Felix Felxis might (can?) have long term effects. As it worked out in the books, both made a great long term relationship. There is no doubt H&H would have been powerful partners, but that could have led the other pairings to worse results.
Excellent points and JK could have built the H&G relationship possibilities further. Then you need to look at R&H. They never got along at first. He hated her in a young age, then she was frustated by him in later books. That can be the early signs of attraction. Then take Hermione's character. She had many of the things that made her much like Ron's mom. She was a strong female figure, very capable in magic, as well a getting into knitting and nurturing of the group. She was the main supplier of food, then cooked it, for them while on the run. Those all made her very attractive to Ron. On the other side, we don't see much of her father's traits. One could assume her father ("typical" dentist) might have had similar characteristics. He was fumbling, socially inept, but with a lot of loyalty. In later years he grew tall, gained a substantial character, and supported her. All those could be what she was interested in. As for H&G, Harry *really* desired to be a closer part of the Weasley family lifestyle. Ginny was attracted to Harry from her first glimpse and did all the fumbling stuff young people sometimes do. Stammering and putting you elbow in the butter is cute. Dating others to "gain experience" is another. Hermioned encouraged this, knowing of Ginny's feelings, which might have steered her away from her own affection to Harry. When Harry took the elixer that opened him up to his attraction for her and may have altered his attraction further. Felix Felxis might (can?) have long term effects. As it worked out in the books, both made a great long term relationship. There is no doubt H&H would have been powerful partners, but that could have led the other pairings to worse results.