When you post them, drafts show creation date rather than publish date when published, and you can only adapt it manually after posting.
At this point it is too late from them to be automatically cross-posted.
This is particularly painful, because drafted posts are by definition usually the highest quality and therefore most important to publicise.
Furthermore, the creation date is baked into the url, which is sometimes highly off-brand for timely posts you’ve prepared.
I suggested this to @manton around half-a-year ago, but I wanted to re-raise this here to find out if anyone else has this issue, or if there’s apps which solve.