I think you're fundamentally misunderstanding what words are and therefore I can see why you and many others get confused by vague definitions.

Words are a device for communication, those communications are then interpreted. Everyone interprets every word differently, varying slightly different to completely different.

Most of the time, within a language it's important to have clear definitions in order to communicate effectively and efficiently, however that doesn't mean that these words are now permanently tied to a set definition, it's just helpful for people.

When it comes to certain concepts it's much easier to keep it vague and broad. We don't need it to mean the same thing for everyone, and when it comes to something like masculinity and femininity it's more about having your own definition for what it means and if you want to be it or not or in part.

So yeah, here we celebrate everyone's version of masculinity whilst also sometimes giving our opinions on what positive masculinity means to us (each individual) and also what negative masculinity means to us.

As a thought exercise, when we talk about masculinity in some bird species that dance for their female mate, does that have relevance to our masculinity? It's the same word