Gender neutrality and gender equality is not the same thing.
Consciously removing the differences from the language does not remove the difference in biology, psychology and physiology no matter how much one wishes to do that.
Inequality and discrimination will still happen, only now there's an umbrella of "gender neutrality" to hide behind. And if differences and arguments have to be settled by promoting that gender is the cause, then the very nature of gender neutrality have allready failed.
Furthermore, removing difference because one gender wants one or the other, like young boys wanting to play with things that stimulates their natural motor skills or young girls wanting to play with things that stimulates their natural empathic skills, only serves to remove the options from the opposite gender. Boys will no longer be allowed to play with dolls and girls can't play with cars if they want.
That only serves to create some very dysfunctional and motorically and emotionally illequipped young people and not these wonderfull, nondiscriminatory young people that swedish gender experts seems to think will appear.
This is not a matter of nature versus nurture, it's both, males will still have more testoterone from a young age than females, and females will still have more estrogen than males from a young age, both these hormones as well as the neurophysiological differences will still have equal say to the way they are nurtured, and removing gender identity will not have any positive effect on the symbiotical relationship of these two factors.
Some boys want to play with dolls when they are young and some girls wants to play with cars, the solution is to let them and not discriminate or tolerate behaviour that says otherwise, not removing linguistic gender characteristics, because the people looking at them will still know the gender and have expectations based on it since -nothing- is done to sort out the inherent judgemental expectations of society.
Furthermore, most, if not all, the research and general knowledge that asserts how children should act and react when they grow up, is based on females. Kindergarten, preschool, school, high school, all are build upon perceptions on how females react to them. Females are at that age, evolutionary, emotionally and physiologically better tuned for sitting still and listening for long periods of time.
Calling them "hen" won't make males any more capable of doing all this.