The problem is that these tests do not sell themselves as "just one data point", and even if they did, you'd have to do so many other things to compensate for the shortcomings of standardized IQ tests, they're really not worth doing in the first place.
IMO the best way to assess fit is to ask someone to handle a hypothetical, or to ask for previous experiences fitting a problem or situation.
(And I would refuse to pick a candidate based on one number. No good can come of this.)
I definitely do NOT want tests of ANY kind to be the norm, but if I'm forced to find a "fit", then I try to take myself out of the picture and balance the team instead. I respectfully reject the idea that this is similar to "measuring skulls" (a comment in the thread).
Thanks for pointing that out. Hopefully I made myself clearer now.