I think it would be great for the tankers to have their own voice lines, although it doesn’t add much to the game, it would add a touch of immersion to being in an armored vehicle. Listening to the commander give orders such as Fire, reload such ammunition and hearing the crew respond and celebrate when taking out an enemy tank or platoon would give a lot of immersion to the combat.
Currently, tankers only have a single dialogue, and this is activated when the vehicle suffers significant damage. It really wouldn’t be a bad idea to add more dialogues.