Ambiguity has been a recurring keyword for me throughout this research so far, and when viewed in practical terms - how far can we go before it is assumed a truth of either x or not x in a form or persona? Before a form stops being ambiguous and can be accepted for what it purports to be, at least on the surface?
For the sake of neutrality and to avoid getting mired in gender identity matters, I'll frame this discussion in terms of the old saying regarding that which looks like, and walks like, a duck. The duck metaphor or stand-in reduces things to a less ambiguous level and helps us to see at which level taxonomies and definitions apply, or cease to apply, and why this may be.
Logically, if it looks like a duck, walks like a duck and quacks, why should we not allow it to be described as a duck? Must we insist upon analyzing it inside-out with regard to its 'apparent' versus its 'actual'/underlying duckness (or lack thereof - usually defined in taxonomical terms of reduction, or its consistent similarity to other entities which have all been previously rubber-stamped with a 'genuine duck' seal of approval, by the hand of someone who is not a duck themselves, but who defines for others whether or not they may be allowed to be perceived as ducks - as opposed to swans, emus, or archaeopteryxes?).
In reality, we accept the following image as being splendidly representative of duckhood:
We also, from a very young age (that is, pre-adult judgement) have no problem whatsoever with identifying the following as a duck, either:
Or even the following - a thing made by hand, with only superficial resemblances to duckhood (can't walk or fly, lay eggs, quack, etc.), yet which is convincing enough to attract real members of that same species:
To then waddle on from the duck metaphor, why can we universally assume that the following image represents an entity we unthinkingly define as "she":
and, paradoxically, also this:
yet are unwilling or unable to do so with regard to this:
It follows, therefore, that a few hundred thousand tonnes of metal or wood is perceived by many as more inherently female than a living, breathing person (who may or may not have the exact same outward biology as an assigned-at-birth female). The connection (or disconnection) is, I perceive, more than semantic or visual - it operates on a gut, instinctive, and emotional level, wherein emotional attachment is more easily transferred to an object/piece of machinery under one's control than a human being capable of the same emotional responses and sensations as the one who does the naming. Perhaps that is the keyword in all this: control, and the implied power/jurisdiction which is invested in the (usually male) owner or commander of a vessel over that technological/mechanical interface, but which is denied in the case of an actual person which is too *similar* to the protagonist, too much like himself, too incapable of yielding to commands on account of shared biology (in the sense, of course, that what is popularly described as "feminine" tends to be identified also, variously, as "soft", "yielding", "submissive", etc. - as witness the recurring tropes of hyper-femininity inherent in the "forced feminization/sissy" area of pornography and role-playing - something for which I have no stomach, and am aware of only for its intersection with the trans* spectrum on the level of cross-dressing and female embodiment fantasy theory. (NB: Despite its appearances, I view this more as a subset of extreme masochism rather than any clear or defined actual gender identification, as it is predicated on the idea of "feminization" representing submission, passivity, and at the extreme end, sexual and other forms of abuse. Thus the debates of how far down the spectrum we may go before we start accommodating fetishism as a form of gender diversity at such public events as Manchester Sparkle - which is a discussion for another post perhaps, but one I have seen argued repeatedly in the past.)
What I'm evidently pushing towards with all of this (but still circumnavigating somewhat) is a code of semiotics and signifiers: whether of the "C'est ne pas un pipe" art-historical variety, or the visualization of Sign-Signifier-Signified - something along these lines, as I see it: