Different therapy techniques are used for treating different problems (and I don't mean the diagnostic label, but rather the contributing factors of the symptoms), so they have to tailor treatment.

For example, CBT is good for correcting cognitive distortions. If a therapist tries CBT when you don't have significant problems with cognitive distortions, they tend to end up stating the obvious, being needlessly argumentative, or just straight-up gaslighting you.

I haven't been able to get help from therapy yet, and it seems that the reason is... I don't have the right problems! The benefits therapy is supposed to confer are things I seem to already have without therapy. Obviously, having those benefits is a good things, but (a) I'd still like help with my actual problems, and (b) it's darn frustrating to repeatedly get advice to go to therapy for my diagnoses.