This thread is misunderstanding the job of Secretary of Defense. They aren't interns learning from the generals how to lead an army or plan logistics. They're project managers who ensure the generals are aligned with the President's goals.
I was surprised Hegseth even desired a side channel that had the potential downside that he could accidentally text the coordinates of a carrier. Stuff like that gets Generals relieved immediately.
I am not as educated in these manners but this type of information seems to be of the type you don’t text on commercial applications and would be on a need to know basis. Maybe you can communicate the idea that something is planned to happen but not timelines of the specific assets.