It’s okay for a man to be effeminate, but for society to function, most men need to be masculine. Because you have to be masculine if you want to be a builder, a firefighter, a police officer or a soldier. Don’t believe me? Women in these positions tend to be more masculine than the average woman.

While I absolutely agree that the "feminine" approach has its limitations (like not being well-suited to certain things, some of them societal musts)... know what? So does the "masculine" one. Which is to say that... gender-roles do. Meaning sex-based stereotypes that dictate, and restrict (like a psychological straitjacket), one's personality: who, and what, you're "allowed" to be... or acknowledge being. Whether or not this has anything to do with your actual personality, preferences, or abilities.

What I think we REALLY need for society to function is everyone being freed of these straitjackets. No more gender-roles; no more "masculine" or "feminine", except as shorthand for biological sex itself (penises are masculine; vulvas are feminine). People should do, and be, what follows from their individual qualities. In effect, we should ALL be a mixture of the personality traits and skills which, though currently designated "masculine" and "feminine", are in fact unisex. Or, more simply, just... human.

So rather than characterizing those who perform functions like builder/firefighter/police officer/soldier as "masculine", it might be more useful to think of them in the following way, as laid out by American author Robert Heinlein (1907-1988):

"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyse a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects."

While I'm not a Heinlein fan or anything, this description of a fully-rounded, competent "human being"-- encompassing both sexes-- strikes quite a chord with me.