This is a myth that Pandas are prudish, it is merely hard to get them to mate in captivity.
Also seeing as it's China there is not much truly open wild space for Pandas so they suffer from a distressed enviroment. An animal will delay or even stop reproduction IF it's enviroment is not conducive to reproduction.
Also they need a big range as Bamboo will flower and die off over large areas regular enough(a problem in China again).
Also the idea they are stupid must be questioned this is highly subjective idea, they are evolved for there enviroment and they have no to low predators hence they seem lazy etc but if they were stupid they would never have evolved at all in the first place.
Overspecialization is a problem as you correctly point out but we are the reason there dieing off, we changed there environment too quickly on them we could take a darwinian view on it but that may come back on us one day.
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