If you dismiss IQ research, you might as well disregard all of psychology. The psychologists who developed intelligence tests were pioneers in using the statistical methods (e.g. factor analysis) that now underpin the entire field. IQ is defined more precisely than almost any other psychological construct. Discarding it leaves you with poorly defined concepts and no clear way to handle them. [1]

[1] https://youtu.be/D7Kn5p7TP_Y?t=47m50s

Oh for fuck's sake.

So: the people that developed intelligence tests were not psychologists; lies, damned lies and statistics; "pioneering" the idea of using math doesn't mean that people using math today are doing the same thing; whatever the definition of IQ might be is irrelevant because "IQ tests" are not rigorously defined; however precisely IQ is defined is also irrelevant because it's supposedly just a proxy for "g"; psychology is not psychometry and so discarding IQ does nothing to the field of psychology.