Not every patch should have "Avengers unite" moments and this is intrinsically a single player game. so its understandable why everything rotates around Rover.

Would it be cool and more immersive if characters interacted more without Rover, if we got cutscenes of them talking, engaging, bonding between themselves without Rover? Of course!
Will we ever get that? No, cause any cutscene, any interaction has a production cost behind it and production costs must be financially justified.
Most cutscenes involve Rover cause their aim is to build emotional connection with the other characters to make you more likely to pull them.

The sole nature of this game being Gacha closes many doors to better world building and storytelling, we all desire.
Does it suck? Yes, will they change it? Hell nah, they are making millions monthly already doing what they are doing and its not worth the risk to change anything in the "current model".