Evading torpedoes in this game makes me wonder about RL

[Shadow]

Originally Posted by Shadriss

Torpedo evasion is... kind of an unknown. The sub crews train for it, of course, but that training is based on assessments of what the opposing weapons can do, and not from any real experience. By which I mean that the only way to know for certain if the tactics work is to get shot at... which I, speaking for myself and what I assume to be most of the sub fleet, would just as soon NOT do.

Couldn't drills be done with warhead-less torpedoes? For all intents and purposes they'd be like live ones for evasion purposes. Only they wouldn't explode if they hit.

Seems too much of an obvious avenue to not have been considered. What's wrong with it?