Not showing us Sunfyre until now is utterly bizarre
Sunfyre is not only the most important and integral dragon in the Dance, he is also symbolic to the story as a whole. The golden, majestic dragon symbolizing what could have been a golden era for the Targaryens. A time in which they had more dragonriders than ever before, yet a meaningless war broke out which completely destroyed both Sunfyre’s beauty and the Targaryens main source of power.
The Dance was meant as a critique to Targaryen exceptionalism, not a feminist story.