Why not both? For the longest time people viewed high IQ (as much as it is an actual distinct thing) as a pure blessing. But more and more is coming out saying

Why not both? For the longest time people viewed high IQ (as much as it is an actual distinct thing) as a pure blessing. But more and more is coming out saying like everything else high IQ is a trade off and by increasing IQ you decrease other factors so it would not be at all surprising if major issues are strongly correlated with high IQ. That said I believe autism specifically occurs up and down the range of IQs and there are generally more people with autism on the low end of the spectrum (it could be equally likely that this is because of the diagnosis bias from the above).