I really shouldn’t have tried to mimic your title.
The post is about the problems you can have even with a friendly telepath. And the problems are (using your barrier phrasing):
Performative transparency—the barrier is doing PR for you, not helping you coordination
Rigidity dressed up as authenticity—the barrier becomes unmovable
The internal hostile telepath—the barrier served protection from a hostile telepath, but the hostile telepath is gone, and the barrier never updated
Dependency on mirrors—the barrier allows you to use other friendly telepaths as an oracle for yourself
I really shouldn’t have tried to mimic your title.
The post is about the problems you can have even with a friendly telepath. And the problems are (using your barrier phrasing):
Performative transparency—the barrier is doing PR for you, not helping you coordination
Rigidity dressed up as authenticity—the barrier becomes unmovable
The internal hostile telepath—the barrier served protection from a hostile telepath, but the hostile telepath is gone, and the barrier never updated
Dependency on mirrors—the barrier allows you to use other friendly telepaths as an oracle for yourself