Yes, I realise all of this. But realistically, we are never going to get to a situation where gender is described as (say) Type A (the gender typical of women/females) and Type B (the gender typical of men/males), thus enabling us to define transgender people as (say) men/males who are Trans-A.
I completely agree that such a system would be the closest to ideal as is probably possible. I also completely agree that a) the words "woman" and "female" are loaded with personal and societal meaning and b) are synonymous in general usage.
But
If transgender identity is going to gain recognition, then society may have to (slightly) adjust the way in which it defines certain terms*. In addition, even if these new "Type A" and "Type B" genders were to be used, it still wouldn't get us past certain issues: e.g. (some) women would still argue "how can this man possibly claim the identity of a Type A gender - only females/women know properly what it's like to be Type A"
I think you realize that I'm only using Type A and Type B as placeholders to avoid the contentious terms. I'm not proposing those (or any ) terms be adapted.
And you are correct that females/women will always contend that they have significant experiences that aren't shared by trans women. And they are right. For us males, I don't think our biology and reproductive system shapes our lives and interaction with the world to the degree that women's do. The weight of the human reproductive system rests squarely on females. That not only includes a fluxing hormone cycle, but also the spectre of pregnancy, miscarriage, breastfeeding, and probably a thousand other things I don't understand. Because I'm male. (Not the gender, the sex.)
When you redefine "woman" as independent of sex, you strip out a whole lot of meaning. But that doesn't mean that they would not accept a term of commonality that reflects where their experiences overlap.
* And we change the definition of words/terms fairly frequently in English. For example, 150 years ago "terrific" strictly and solely meant "causing or inducing terror".....
Yes, language evolves. I think it does so naturally as usages change. I'm not aware of a previous concerted effort to deliberately change a definition, but I'm not a linguist. However, I don't know why you would be surprised if there was resistance to the idea of changing the definition of a word that has so much vested meaning for so many people. Regardless of if the definition evolves or not, I think its unfair to paint people as bigoted for objecting to it.
You think that if a scientist in 2020 (or 1980 for that matter) put forward a hypothesis that homosexuality is in fact the product of a mental disorder.... this would be accepted academically (or in society in general) as a reasoned and un-noteworthy hypothesis??
You mean something like this:
https://www.sciencemag.org/news/2015/10/homosexuality-may-be-caused-chemical-modifications-dna
or this:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4545255/
I realize that they don't attribute homosexuality as something to change, but they
do explore the possibility of something occurring genetically or in development that causes the condition.
But that's not the issue here. The issue is whether identity/behavioural beliefs are either a) valid lived conditions in their own right, or b) disorders or the product of a disorder.
I don't think they are caused by a disorder. But I think it may sometimes indirectly result in a disorder.
Calling something a disorder (or the product of one) necessarily implies two things: 1) that thing is an unwelcome aberration from the "norm", and 2) medicine has a valid claim for trying to either treat or "cure" that thing.
Schizophrenia is a disorder. It is an unwelcome aberration, and once diagnosed it's usually treated with various types of medical intervention - with the aim of minimising or even eradicating the disorder.
And this is exactly how transgenderism (and homosexuality, for that matter) used to be viewed - both by mainstream medicine/science/social-science and by society in general.
But not - thankfully - nowadays.
Would dysphoria be a disorder?
Caused by the condition of being transgender? Or rather by the condition of the internal sense of self not matching the physical self?
Which is treated by transitioning?
So being trans is the treatment for the disorder resulting from the condition?