Is it that you don't know what the problems / symptoms are that you feel are disrupting your life, or is it that you don't know why you are having the problems / symptoms that you are having?

What and why seem to me to be two seperate questions (though often coming to a good why understanding involves redescribing the what).

Most treatments are focused on symptoms. You start out by coming up with some kind of list of what the person says is the problems / symptoms that are disrupting their life.

How does attaching a name to those help? I'm not really sure on that...

But I do, of course agree that making sense of why one is experiencing them and why they are problematic is an extremely important and worthwhile thing...

I'm just not sure how current diagnostic categories help the issue along...

It sounds like you are uncertain about how much your present treatment is really addressing / helping the symptoms that are most problematic for you. Does that sound right to you?