Iran telegraphed their attack very openly it’s not likely they intended to do heavy damage. Rather cost a lot of money in projectile interception.
This is defense by Iran. If they don’t show that israel can’t blatantly bomb anything they like and kill top level Generals, israel will keep doing it. The bully won’t stop until the bullied fights back.
Also their targets were the israeli military airports that housed the F35s and F16s for the bombings.