I'd like to hear an answer to this as well, Steersman, one that doesn't require "reading between the lines."
Done.
I'm happy to admit that the OP definition (or the past/present/future version) might well cause confusion ...
Hallelujah! Progress!
... but can you think of a specific situation in which that confusion would prove problematic? Like, maybe, the queue at a sperm bank?
Think I've already given answers to that - in exhaustive if not exhausting detail, ovotestes and sequential hermaphrodites in particular. Although those may be more technical and not likely to have direct or immediate effects on the majority of the public.
More problematic is the question of two contradictory definitions in play in the school system, one for the kiddies in their biology classes, and another for their
social-justice social studies classes. Think Del Giudice's essay speaks rather directly and forcefully to the ubiquity of the problem:
"On a deeper level, the ‘patchwork’ definition of sex used in the social sciences is purely descriptive and lacks a functional rationale. This contrasts sharply with how the sexes are defined in biology. From a biological standpoint, what distinguishes the males and females of a species is the size of their gametes: males produce [present tense indefinite] small gametes (e.g., sperm), females produce [present tense indefinite] large gametes (e.g., eggs; Kodric-Brown & Brown, 1987)"
https://www.researchgate.net/public...ical_Bias_in_the_Psychology_of_Sex_and_Gender
I'm > 99% confident you will never find anyone at OED claiming that they are promulgating stipulative definitions.
So what? If dictionaries' claim to fame and fortune is descriptivism, is to publish records of common usages, and if some scientists have published such definitions then, ipso facto, they're publishing stipulative definitions. Particularly if the former happens after the latter.
But you might take a gander at Hilton's Substack, this passage in particular:
I’ve been working on a legal document and was discussing with a colleague about my efforts to find a citation for the statement: “there are two sexes, male and female”. He laughed at the idea that this would require a citation, told me to check a textbook, then realised that this statement is so simple that it would not even be included in a textbook.
Link and bonus link to my comment thereon ...
https://emmahilton.substack.com/p/sex-denialism
https://emmahilton.substack.com/p/sex-denialism/comment/8511640
Bunch of deleted responses to my comments from "Middle Aged Lady" - who claimed to be a molecular biologist - probably because she was embarrassed by her idiotic claim that "Every cell has a sex."
In any case, Hilton had something of a point about the lack of even a stipulative definition to the effect that there were only two sexes - in anisogamic species, of course

- in biological textbooks. But likewise with a lack of such a definition for the sexes themselves - which the HHWH at least tries to rectify, even if it is remarkably and profoundly flawed from any number of perspectives.
So it may well be that your interpretation of "female" is what's causing the conflict.
Not quite sure how much "interpretation" is involved in noting that the "definitions" of the HHWH conflict rather starkly and profoundly with the presumably much more popular and current definitions from Google/OD:
The latter set of which I might emphasize say absolutely diddly-squat about any "past, present, or future functionality".
Kind of a smoking gun on the "confusion" case if you ask me ...