So? We're "stuck" with them
because they're the stars of the show. You may not like them personally, but that doesn't mean that DISCOVERY needs to concentrate on some minor background characters instead. It's not about the numbers.
Would
The Brady Bunch have been better if they'd had four more children? Would
Gilligan's Island have been improved by four more castaways? Would
Columbo have been a better show if they'd spent more time fleshing out the guy who strung up the homicide tape at the crime scenes?
("I don't like that Columbo guy. He's sloppy and annoying. Why are we stuck with him? Why can't the show be about those other cops in the background? Then we'd have more detectives to work with.")
Shows have stars, and supporting characters, and background characters. That's how it works. And there's no rule that says that everybody on the bridge of a STAR TREK show has to be a major character.
Sometime Lt. DeSalle is just . . .Lt. DeSalle.