I know not everyone liked these radios when Cold War and Vanguard where the current games at the time but as someone who mostly plays public matches or solo cursed I really do miss not being able to hear all the crew interactions for each map.
It can be quiet rare to get a pub with 4 crew members and I feel like if Treyarch used this mechanic again you could have a match with random operators and still get the story of the map from the crews PoV. I also think it would be a good way to make the 8man crew feel like they are all there as well as if you did have 4 crew members you could have dialog from the ones who aren't present.
For me I think it's the only thing stopping BO7 zombies from being the perfect game for me and seems like this could be a simple fix.