Those type of tabs mean that airspeed-induced control-loads are dealt with by well designed servo-tabs sitting in that same airflow. Fabulous control feel & feedback. Light and progressive stick loads, light gauge & light-weight control runs, and all self powered to boot. Lose every service and you don’t have to *think of unpowered controls problems. (I’m looking at your flying hefferlumps, Mr Boeing.)
Bring back the 707 and its balance tabs.