The major problem with what is coming is the deception causing humans to embrace the extraterrestrials as saviors and their message of "being here to rescue humanity." Whatever they leave, in the way of helpful knowledge they might bring forward to demonstrate their good intentions, will almost certainly have long-term downsides. That is true of everything they give humanity, in terms of technology, so you can expect there will be a detrimental consequence that will be insidious and not overtly detectable.
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