What dazzle camouflage could actually achieve

How effective was dazzle camouflage?

It could make long-range tracking and quick firing estimates more difficult, which was the limited task it was designed to perform.

Dazzle camouflage could make a ship harder for a submarine to track at long range. That complicated the quick estimate needed for a long-range snapshot attack. Disrupting the firing solution was the limited purpose for which it was judged effective.