The Overton Window assumes that, on any specific political issue (that is, an issue that influences the way people vote) that all opinions are spread like a normal gaussian, with the X axis being the degree of agreement or otherwise, when the political matter is posed as a proposition.
Today I would argue that this assumption is broken.
Back when, what kept people in a tight gaussian distribution was that they were mostly using the same sources of information, ie broadcast media, to which they had a level of agreement or disagreement response.
Now the number sources of information have exploded, mainly through the web. So the glue that create the Gaussian, broadcast media, had been displaced. So we have pockets of people all over the curve; it’s multimodal now and not a Gaussian.
Which is why I guess you see perfectly sensible politicians contemplating policies that, on the face of it, would be outside the classical Overton Window.
For example, Albo is pushing the Voice, when clearly it’s not politically smart to do so.