Communication between characters

BO 3 and 4 were memorable to me, among other things, for the communication between the characters. It revealed them even more, gave us funny facts and references, it was nice to hear support for yourself during the battle. In BO 6, all the heroes became so silent... I mean, everything they say to each other is connected to scripted situations during the passage of Easter eggs, but not connected to simple gameplay. Why did we lose this?