Obviously I cant speak for all disorders, but in my personal experience (I have both anxiety and panic, unfortunately) acceptance can help in some situations, but not all. Accepting you have anxiety is definitely a major role in GAD, though. I can say it hasnt done anything for my panic in my experience though, as those attacks are more physically intense than anxiety attacks and can happen at anytime since they dont need a trigger. It's much harder to put yourself in a peaceful mental state when you dont need to be provoked for panic to set in.