I already commented in the past how I don't feel the gay thing adds to the story. In fact, I consider it a significant achievement of Rowlings that she attenuated the sexuality in an all time best seller and managed to convey that love is really about commitment, rather that sexual arousal, which she very much deemphasized.

1) I don't see why you think "the gay thing" has any connection to whether commitment or sexuality is emphasized. Unless you think homosexual love is inherently sexual in a way heterosexual love isn't. But I'm sure you don't think that way.

2) With respect, "the gay thing" adds just as much to a story as "the straight thing" does, and if you mind the former more than the latter...well.