That's also why Assange (and others) developed the Rubberhose file system[0].
It's based on the game theoretic idea that if your adversary has no way of knowing how many hidden partitions you have, then you have no way of proving to them that you've given them all your secrets.
As such, there is no benefit to you revealing any secrets under torture, because the torture would continue even after you've told them everything, therefore there is no point to them torturing you in the first place.
If they don't understand game theory, that just means they will act sub-optimally. In any case, the correct strategy for the user is still to not decrypt any partitions, since, as you say, the sooner the user stops decrypting, the sooner the torturers give up.
That seems like a pretty foolish assumption to make of your adversaries/captors.
If a torturer has good reason to believe you have valuable information regarding subject X, they'll simply torture you until they possess that information or you die. If you don't possess the information, you're screwed. If you do possess the information, it's likely that they'll stop after they get what they're after.
A state liable to torture you may simply kill you instead. Or torture you and kill you, even if it serves no particular purpose.
If you're in the business of protecting your secrets against torture then you need to also be protecting them against death because that is grimly inevitable.
That's not really making the case for clever crypto solutions. Assange is rotting in prison and is probably going to die in the US in the near future. What secret information could he be protecting at this point?
It's based on the game theoretic idea that if your adversary has no way of knowing how many hidden partitions you have, then you have no way of proving to them that you've given them all your secrets.
As such, there is no benefit to you revealing any secrets under torture, because the torture would continue even after you've told them everything, therefore there is no point to them torturing you in the first place.
[0] https://en.wikipedia.org/wiki/Rubberhose_%28file_system%29