I don't remember if it was prompted by Paul Campbell deciding to leave the show or not, but the way I remember it is the writers' thought it up during the hiatus, thinking that as the voice on the other end of the radio, Dee would have a special rapport with the pilots, a seed of an idea that didn't end up having the slightest bit to do with what actually happened.IIRC, wasn't that the result of Jamie Bamber and/or Kandyse McClure requesting the two characters develop a relationship, knowing that Billy (Dee's original love interest) was going to be written off?
DISCO has really only four to five main characters, they certainly have room to add someone else or flesh out those glorified extras. Jet Reno is a great addition to the series, even though she's only recurring. Give us a Jet Reno at the conn, a character who has a personality and a point of view and can enliven the show instead of just nodding and pressing buttons.
It's amazing to me that so many people on this thread seem inexplicably opposed to making the show more interesting. Shrug.
You go watch any of the three episodes where Harry Kim was taken advantage of by space-babes and tell me again how obligating yourself to feature characters specifically because of their jobs will ipso facto make the show more interesting. Though, considering how Discovery burns through plot material, if that happened now, he'd probably be kidnapped by three different space-babes at once, which would probably be interesting in some fashion.
No one is against fleshing out the recurring cast. What we're wary of is featuring them without fleshing them out, relying on the fact of them having a stock Star Trek job making them interesting no matter what is written, plotted, or acted for them. We all would've been happier if the writers of Enterprise hadn't committed themselves to, say, Mayweather's space-boomer backstory before they realized they had no interest in exploiting his space-boomer backstory. Imagine if he'd been some one-off character that they could reuse or ignore as they saw fit.
The trouble is, Discovery season two seems to be going for inspiration from the '90s shows with how to "develop" the recurring cast, rather than "auditioning" them like TOS or nuBSG did and reacting appropriately. They should be using the bridge crew more, but not by jamming them into conference room scenes or away missions based on surprise backstory. Throw in a little more breathing room, give them some characterization, a weird hobby (or, like Sulu, every weird hobby), let them play a sport, and then see what comes out of that and if its worth having them do more than just nod and press buttons, or if it'll just be an episode of obligatory, keeping-the-actor-happy table scraps.