the mc is basically a idiot with all whole bunch of advanced knowledge its like giving a dumb person the most advance computer in the whole universe and they only use it to what adult movies because of the graphics as for the people of that world it's like the author is trying to make them dumb so that he can make the mc look more smarter that he actually is like at the start is was okay but there is absolutely no progress in his personality he is just like a clueless baby whose only program to not use his brain when everything is laid out right in front of him and to help and be use by every character he comes across just for the sake of moving the story forward
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LIKEI would say the MC is ignorant rather than stupid. After all, he never had any social interactions with other people after he transported to the cultivation world. And MC is a mortal before being trained by the System, so it makes sense for him to be ignorant about cultivations and cultivators.