Dulcemio:
However, I don't think the majority should have to subordinate their feelings about masculinity and femininity, whether those feelings are innate or learned, just to make a minority feel more comfortable about their place in the world. That would be disingenuous and condescending.
I'm pretty sure everyone has problems with masculinity and femininity at least at some points in their lives, both with their own and other's - be it in behavioral roles (gender performativity

), vocational fields, child rearing (men are actively if not deliberately dissuaded from engaging in home or work engagement with children and thus wonderously don't feel comfortable with or responsible for them), household chores, ... being predominantly male or female is a lifelong struggle avoiding pitfalls (more so if you switch genders).
MRoth:
And it's very difficult to study how much of gender identity is innate and how much is instilled, even learned passively via a very gender-focused culture.
As for the innate traits, Cordelia Fine has composed an outstanding collection of studies and articles debunking gender myths called "Delusions of Gender". Similar feats can and have been undertaken for physical traits to some extent.
MRoth:
As for who gets harmed by going along with the gender binary? Well, anyone that doesn't fit within it, to be honest. Intersex, transgender and third gender individuals, and to a lesser extent those that are cisgender but don't fit the prescribed cultural mould. So, to these people, breaking from a binary into a spectrum would mean a world of difference.
Agreed! Personally I mostly refuse categorization and have made many a man (and some women) doubt their choice in bathrooms.
Dulcemio:
Marketing sure does work. And PR Black XS is another example of pricing discrepancy
An ex-girlfriend of mine loved the original Black XS for men

I also know women who love Joop! and Givenchy Pi, whereas I tend to prefer heavy orientals like Shalimar or Opium.
Sorceress:
And yet men are still the higher paid wage earners for the same job. They make more money, yet must be lured in by a lower cost. Women traditionally scrape by and will also traditionally pay higher for a perfume. And statistically what is the ratio of men to women as marketing execs? Hmmmmm......our world still is not equal and I wonder if it will be for my grandchildren or their grandchildren?
Yeah, marketing is responsible in a big way for the gender rift, starting at the "pink aisle" via the
technogaming stuff girl's aren't allowed to look at to perfume marketing ... and a strong gender boundary reproduces gender bias in profession, income, career models, paternity leave agreements ...