Mortar uses should stay in 1st person because if given 3rd person view it would be too powerful to avoid being ambushed.
Mortars should deal more vehicle damage especially for direct hits
Mortars should allow you to pick them up again (because the equipment is literally designed to be man portable)
Mortars should have the SMOKE rounds buffed to be just as big as the thrown smoke grenades, current implementation is a joke (too small and no duration)
Mortars HE shells should have damage buffed where a 2.5 meter radius should be lethal (over 100 damage) vs standing infantry and leave crouched/prone infantry barely alive, with damage dropping off towards 20 meters (more realistic).
Mortars airburst shells (if implemented) should have more consistent damage spread throughout the entire radius but have a reduced lethal radius as a balance tradeoff. So therefore it would be less effective at killing at point of impact but deal overall more damage near its more distant radius limits.
Mortars should not be able to just hold down fire and shoot indefinitely as they currently are. They should behave similar to vehicles ammo or engineer rockets where there is a quantity of shots to be fire and then it must be replenished via ammo crates etc. This way when fully stocked, a mortar uses can hold e.g. 20 rounds and then they must restock with resupply (either with teammates or stop firing and drop it).
When mortars fire, the explosions to propel shells in the air should be much louder (its very loud in real life).
After all this, mortars would be in a better place in the game.