I like fairy, but I'm not sold on it being mandatory for balance. They didn't have to make it.
Dragons naturally tend to be strong(kinda duh,) but the attacking TYPE stinks, with only one Se Target.... who hits you back equally rofl. I mean maybe a slight nerf on dragons/more strong steel options. Or even make fairy just a resist. It seems strange, dragon is now a pretty awful attacking type, bar like STAB DM But that's for bp.
Idk, maybe that's too simple of a look. Since fairy has other type stuff to it than drgn ofc. It probably hurts bug and offensive dark too much, but is practical for buffing fire and hurting fighting both ways and dark defensively.