Interrogating the question before answering it
The question "why have there been no great women artists?" hides its answer in how it is phrased, because it assumes that greatness is an innate quality that women lack. Taking the question at face value leads to defensive work that props up the premise, such as searching for forgotten female Michelangelos or claiming a separate 'feminine style.' The productive move is to ask what assumptions make the question seem natural, and to answer those instead.