In verbal taʿqid, displacement of related parts makes the syntactic connections difficult to recover. Taqdim moves a component forward; taʾkhir moves it backward. Neither operation is intrinsically defective.
Difficulty can arise when a modifier is far removed from its head or a dependent is displaced so that its governing word becomes hard to identify.
Arabic frequently uses fronted objects and predicates in fully eloquent constructions. The problem is not displacement itself, but unnecessary obscurity in indicating the intended relationships.