It’s a classic, if somewhat exaggerated trope in Star Trek: The ships first officer, second officer, tactical officer, chief engineer, chief medical officer, and a random ensign beam down to an unsecured planet while some dangerous problem is either ongoing or likely to occur. The Doylist reasons for this are as obvious as the Watsonian reasons it seems so silly: these are the main characters who are supposed to get the bulk of the screen time, so they are constantly thrown into situations which real world commanding officers and department heads are generally kept well clear of.
But what if this wasn’t the precedent established in TOS and continued in every subsequent series (including, to a slightly lesser but very real extent, Lower Decks)? What would a Star Trek show look like which still had senior officers who we are meant to care about and who still get significant development and screen time, but who aren’t thrown into unrealistically dangerous situations on a regular basis? Could such a show survive telling stories without visibly putting those regulars lives on the line so frequently? Would it be viable to keep the focus on things that happen either aboard ship or in nominally safe situations? Alternately, could a show successfully develop a cast of lower ranking “away team” characters who get the “dangerous” screen time while keeping significant focus on the major decision makers on the bridge? And how could the shows manage such a visible separation between “expendable” and “not expendable” crew while maintaining that humanist, optimistic, everybody-has-an-equal-right-to-life ethos?
It wouldn’t be an easy thing to pull off, certainly. But how could it have been done?
Your post reminds me of a few episodes of Voyager where its strongly implied the rest of the crew are going on away missions - we just don’t see it. In the episode “Good Shepherd” Janeway mentions the 3 troublesome crew members have “never been on an away mission”. The plain text reading is that the rest of the crew are - we just don’t see it.
As to a show structure where we want to make sense of senior crew going on away missions, but the more logical characters aren’t going. I am thinking maybe a show with elements from something like ‘Mass Effect’. In Mass Effect the Normandy is a small ship with a small crew, the main character is a commander. So, the main characters are fulfilling their posts as crew on the ship, but are also the away team.