I think this is so for gameplay purposes. If escorts prosecuted their searches much longer, as they did historically, we'd be looking at multiple hours spent under after being detected. In most cases, this would simply cause parties to give up and start a new lobby once detected, which is of course less than ideal because it removes a significant part of the U-boat experience.
Much like torpedoes that reload 10 times faster than in real life, the escort behavior too is altered to offer a form of "soft" time compression. Overall, this is a good thing for the type of game Wolfpack is. It can't be exactly like Silent Hunter because it's multiplayer, real time, has no save system etc.
Ironically, more realism doesn't always mean more fun, although too little realism is a turnoff. Maybe we need realism settings per lobby. Oh, that reminds me:
https://steamcommunity.com/sharedfil...?id=1695740380