The state’s lawsuit claims that the Fish and Wildlife Service’s listing requirements are “nearly impossible for the public to understand”

As in, the requirements for things to be put on the lists of endangered species? Yeah, no shit, those requirements are probably made by experts for experts. The “public” doesn’t have the subject matter expertise to determine every topic, so there’s a point where we have to trust these experts.

and give vague guidelines on what developers and landowners can do with their own land in the critical habitat.

I’m guessing the guidelines are pretty clear if you’re not struggling to look for loopholes.