You could say the same for many of the Alien movies that DON'T focus on Alien size crews. Which is like the rest of them.
People remember the final Marines in Aliens more than the whole cast because they were given more screen time. You'll notice aside from early meme action that nobody nowadays really talks about Ferro, Spunkmeyer, Crowe, Frost, Drake or Weirzbowski when compared to Hudson, Hicks, Vasquez, and Gorman. Simply because the latter had WAY more screen time. I'd say only Al Matthews spot on performance as a senior NCO is the only exception out of that movie. Same with the Betty crew vs the Auriga crew. Or anybody not named Ripley, Bishop, Clemens, Dillon, 85, or Morse in Alien 3.
I think the writers of the films just need to realize that nobody really cares if nobodies get merc'd its only when you can actually connect with and relate to characters do people actually give a damn whether they live or die in a drama/action/horror sci fi series.
That is why I feel the marriage dynamic was wasted in Covenant. If it wasn't said in passing expository dialogue, I probably wouldn't have even noticed. It could have been used for more emotional depth to make the deaths feel like a kick in the nuts, instead it just seemed like coworkers upset other crewmembers were dying but they'd get over it if they made it out.