Saying that the spec should contain more guidance implies that that guidance is relatively obvious. It also implies that there is one correct way to resolve the

Saying that the spec should contain more guidance implies that that guidance is relatively obvious. It also implies that there is one correct way to resolve the issue that the guidance would resolve. That might not be the case. So it is usually best not to claim a specification issue where none technically exists. Just state clearly what you think should be done and leave it at that. The specification might not be incomplete depending on what approach is eventually taken.