إِيَّاكَ نَعْبُدُ وَإِيَّاكَ نَسْتَعِينُ
You alone we worship, and You alone we ask for help.
The first iyyāka belongs to worship; the second belongs to seeking help. Repeating the object foregrounds exclusivity with both verbs individually and creates balanced parallelism. Omitting the second object would alter both prominence and structural symmetry.
The shared form does not erase the difference between worship and seeking assistance. An adequate analysis explains both the structural parallel and the distinction in what the two verbs denote.