Why uncrewed towed sonar is being introduced cautiously

Why are navies not yet widely using drones to tow sonar arrays?

The operating environment is difficult and navies are reducing technical and program risk before relying on the capability.

Small uncrewed systems face difficult operating conditions in deep water and demanding sea states. There is also an institutional constraint: a visible early loss can jeopardize funding for a promising program. A cautious sequence of trials is meant to make later adoption a low-risk swap rather than a dramatic leap. The pace of fielding is therefore a program-survival problem as well as a technical sonar problem.