we use vipassanā for eliminating each kilesa one by one, not jhāna.

We can not use jhāna for slowly stopping 5 hindrances one by one, but we use vipassanā for eliminating each kilesa one by one.
Jhāna-wholesome-mind just avoids 5 hindrances-mind-factors by arising instead, not eliminate. So, 5 hindrances can stop by just make jhāna arises. After Jhāna-wholesome-mind vanished, unwholesome-mind can arise with 5 hindrances-mind-factors again.
Vipassanā-wholesome-mind eliminate each kilesa, such as each hindrance, by eliminating every taṇhā, attachment. Vipassanā is not the substitution, but it is the real eliminate.

However, jhāna is the most important base of vipassanā.