We have a submission! Please note this is NOT necessarily my opinion (but I don't necessarily disagree with it either), but I'm posting it for discussion.
There are plenty of reasons not to like the idea of transcorporeality. There's erasure, misinformation, fundamental differences
Let's look at the LGBTQetc community. Lesbian, gay, bisexual, queer, questioning, asexual, and pansexual, (these three are from the 'etc' part) are all sexualities*. "Trans*" is the only part of that acronym that doesn't refer to a sexuality. But many people outside of the LGBTQetc and GSM community believe that trans denotes a sexuality, partially because it is always lumped in with sexualities. Another side effect of this is that the trans* presence within the LGBTQetc community is constantly erased, and their goals and needs put on the back burner.
This is the problem that comes with grouping unlike things together. While many people appreciate the comradery a large community offers, smaller subsets are often ignored or pushed aside.
One of the biggest issues I as a trans* person have with transcorporeality is this. I do not want to be a part of another community that doesn't take my needs into consideration. When you tell people that being transabled is "just like being transgender", but you yourself are not transgender, you are erasing my experience. You're giving people a false impression of what it means to be trans*.
Again, the grouping is also an issue. Ethnicity=/=gender =/=species =/= ability. None of these things is even close to being the same. They're not impacted by society in the same ways either.
For example, otherkins aren't fighting for what transgender people are right now. Right now, the otherkin community seems to be focusing on education(1), visibility, respect, and community for itself. The trans community is working on achieving rights, medical coverage, and discrimination laws as well as education, visibility and respect for itself. Unless an individual is a transgender otherkin or an advocate for both, there is essentially no overlap between communities.
I fully support the otherkin community, but I feel tying us all in together gives people a lot of misinformation.
* Not getting into the difference between romantic attraction and sexual attraction right now.
(1) By education and visibility, I mean for nonhuman idenities
