But if you only have hours to rehydrate your not gonna push your body to that dangerous lower limit.

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To believe that boxers wouldn't attempt to push their bodies to dangerous limits is nonsense. If they were all that rational, their wouldn't be a problem in the first place. Boxers put themselves through exteme conditions to meet the weight limits, and pushing them to do a weigh in the day of the fight will only make it worse. They will struggle to meet those conditions, but go through hell trying to get back to normal.

And if you can assume that they wouldn't do this, then you would have to assume that they never have. Which of course they have. Thats why the rule was changed.