The most extreme gender role radicalism is about letting the child developing on their own, without outside gender influence (it might be stronger radicalism, but they aren't in the media). This is of course interpretated as trying to completly wipe out any gender difference, while the end result if perfectly done (probably impossible), would show the natural differenences and the overlap. This is very rare.
A very interesting proposition, but could only work in a laboratory setting. Would be very useful...