I do differentiate between genderfluid and questioning, and only call the latter "non-committal" (that distinction is made in the next sentence in the Wikipedia article), although I guess mentioning it next to fun crossdressing could play down the exploration process. And I did make the distinction between biological (sexual) characteristics, gender expression and gender identity (which is usually based on some or all gender characteristics).
I suppose I didn't make myself clear enough: it's up to people to select their gender identity based on their feeling, and also a separate gender expression (although they tend to correlate), regardless of biological characteristics. What's new to me is that the "genderfluid" label can refer to gender expression varying across the body, not just in time. Yes, the title is a bit reductive and I guess it might be incorrectly interpreted as one implying the other, hence the explanation (which only lists a couple examples of common identities of feminine-looking people with penises). Not to mention, terms are evolving: "bisexual" used to be a synonym of "hermaphroditic".
By the way, use the forward slash for an ASCII ≠ (=/=), a single backslash gets hidden by most Markdown interpreters
Yes, I agree.
TL;DR: Labels are self-assigned and should be, and forced (un)labeling is not acceptable. However, this does not mean they are meaningless − after all, pride flags are based on them − so it makes sense to know what people tend to mean when they assume a specific queer identity, and know how to pick words to describe one's own. Prying into the specifics of a person's label should be governed by social conventions, much like discussion about sexual attraction, kinks or genitals.