The reason it does not happen with the newer F53's is that Ford is now fitting track bars as OE equipment.
Sure, shackle wear, weak shocks, side to side flex in the tires,etc can contribute to the issue, but the primary cause is the side to side motion between axle and chassis. A track bar CURES that.
BTW, track bars are nothing new. Have seen then in museums on buggies built 150 years ago. Yes, they had long leaf spring suspensions. All air suspensions coaches have them (or equivalent), as there is no side to side motion control in an air bag.