you left out the "positive" in your analogy:
trans, non-binary people only need to have a satisfying, meaningful life without a vision of positive masculinity, femininity, or gender Identity
Of course it makes sense to have a concept of these things, but the point is that it is not helpful to define these things with positive or negative values, but rather to look consider these things independent from one another.
I feel like the point is rather that instead of redefining masculinity into something more positive, we should rather deconstruct gender norms in general. Because regardless of masculinity being something "positive" or "negative", it is still an expectation for people to live up to. And eventually people will fail to live up to them. That's why I would say it is preferable to deconstuct gender as a whole, rather than redefining it.