It can be procedurally very long and drawn out, especially in less welcoming states.
To your point, transitioning is a massive process. Making something bureaucratically painful significantly easier is very welcome to an overwhelming process.
This isn't just useful for transitioning of course. I'm cis, but the way my name is spelled in official documents makes Americans pronounce it wrong (not their fault: it's just bad transliteration).
Going and changing it is a pain, and would make many simple beurocractic tasks more complicated, having to explain that every document printed before the change does indeed belong to me, and here are the name change documents, and yes, I know this makes your computer system barf, etc etc.
Systems that have a separate field for a government name are great: I can have the Americanized spelling for the display name, without the hassle.
The vast majority of people who are trans do not have surgery and being trans has nothing to do with your genitals. I feel like this really shouldn't need to be explained in 2024.
