The problem arises when there is a perception that strength can only be achieved via the weakness of others. The worst kid-lit offender is Peppa Pig. It is of course fine to make female characters good at things that were traditionally in the male domain. But while Mummy Pig goes around fixing everything, Daddy Pig bumbles about, barely able to tie his own shoelaces. The author does allow him to have a job, but you imagine that when he gets there he’s just being used as a porky footstool for his cigar-smoking female boss.