There are various legal and practical implications if we ignore diagnosis and patients have tendency to ask questions about which they have partial knowledge.
Most of their knowledge comes from google search and they are highly mislead.
Based on what they ask questions.
Like you said there is no specific medicine for specific disease in homeopathy.
But, the truth is, the test helps to rule out other conditions and makes the diagnosis confirmed.
Once the diagnosis is confirmed then we have common symptoms of the disease which helps to group out most uncommon peculiar symptoms of the patient to select the best suitable medicine.
The test result also helps to measure the improvement after homoeopathic prescription.
E.g. if a patient's serum
creatinine was 3 and after treatment if it comes down to normal range, it is provides evidence of effectiveness of the treatment.
I am very happy that patients like you are actually becoming aware about various treatment and asking questions.
Just make sure you are not being prejudiced or misinformed.