Do you really though? Wouldn't you want them to say "I don't know, but here are the next steps I think we should take to continue getting to the bottom of this

Do you really though? Wouldn't you want them to say "I don't know, but here are the next steps I think we should take to continue getting to the bottom of this (further tests; the doctor reviewing literature or consulting with colleagues; a referral to a different specialist etc)"?