I agree that long range detection is feasible ... I can't argue with the facts. I do question it's reliability and whether it can be considered a reliable tactical tool. If PE and Bismarck had not turned away due to PE's erroneous torpedo warning at Denmark Strait PoW might have been in serious trouble. There are also times when biological interference can make an entire sector opaque to sonar unless you have very sophisticated signal processing. Also, own ship speed is very significant. On an SSN we could detect things much further away at slower speeds, and this is on a ship with very extensive power plant quieting built into the design. Just the flow noise past the hydrophones can make a difference in signal to noise ratio, and power plant noise travels through the hull, not just from a long distance in the water. On a cruiser, for example, you have all kinds of motors running to train guns, pump bilges, lift ammo from magazines, etc.

I don't (can't) deny that it proved extremely useful to the Germans in a few situations. The USN had sonar on CVs for a while but eventually gave it up.