I also think there's something to trans people not having a lot of "soft power". I don't think they have real world levers to pull, so they focus on what they can control such as the HogLeg boycott.

When I say real world levers, I'm thinking about something similar to how the black community rallies around victims of police brutality. They have the numbers for marches. They have a lot of politicians (relative to trans people). There are a lot of famous black people who push this stuff forward.

Without trans people having the numbers for soft power like other communities, I can see why allies are very important to them.

Also, this is just some conjecture by me. The other part is that transphobia is much more socially acceptable than most other forms of bigotry (but I guess part of that is it wouldn't be if they had more soft power).