Hi,
what do you mean with
At the moment, repository integrations in Transifex don’t yet fully support
.xcstringsfiles in the way you describe
From what I understand, the GitHub integration simply doesn’t support xcstrings (you can give me an example of a working setup if I am wrong)
As I said, we had to use this manual approach since Sept 2024 (after a lot of back and forth with transifex support), even though apple released XCSTRINGS with Xcode 15 on June 2023.
I saw the previous question about this very topic more than a year ago 
Basically the speed of development has been incredibly slow and the documentation GitHub: Installation and configuration | Transifex Help Center in this case gave me false hopes that you actually supported the GitHub integration right now.