I don't think it's odd at all.... the only reason it's not saved until
the Parent is initially saved is if the parent has no ID, how cna you
assign parent_id to the child ( or the join table ).

If you're modifying the children w/o touching the parent.... say
categories and posts in those categories....  It would be up to the
category model to validate any changes you make to it... and if you
changed a post in one of those categories... or changed the category
the post belonged to... why shouldn't it be changed right away?  Why
would I need to re-validate the category?
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