> I think beyond a certain level surplus IQ begins to cause problems.

YES, with an emphasis on the idea of "surplus IQ". If you are similarly blessed with high EQ, great social skills, athletic talent, etc. - not much of a problem. Vs. if you're nothing special (or worse) in some of those other areas, while having a metaphorical Mjölnir in your IQ toolbox - Big Problems. "Solve it with IQ" becomes your go-to strategy in far too many situations, you tend let other skills type atrophy...and treating everything as a metaphorical nail really doesn't work well.