Ooh. I think I can answer that one. I don't want to speak for [MENTION=25352]mrpopstar[/MENTION], but that did come up earlier. It seems to me that mrpopstar considers applying proficiency from skills to different types of ability checks (which is presented as a variant rule) to not be RAW (even though it is a rule that is written) and, therefore, assumes it is not in play.*
With those assumptions, it becomes easier to understand (but not necessarily easier to agree with): Medicine, being inextricably and exclusively linked to Wisdom, cannot confer knowledge of anatomy, biology, or anything else, nor logical analysis of said knowledge, because knowledge and reason are the providence of Intelligence. Wisdom can only offer intuition and instinct to the situation. Proficiency in medicine, then, can only represent such an approach. At least, I think that's his position.
It makes sense. I just, personally, disagree with the fundamental assumption it is built on. The variant rule exists so that people who recognize that it improves their game can use it (why write it at all if the assumption is that it won't be used?).
* Not that it's relevant to the discussion at hand, but I am curious if this hardline approach extends to optional rules, such as feats and multiclassing, as well.
Thanks. If indeed he would agree with your summary, then I understand a little better.
I fundamentally disagree, but I understand.
The single best thing 5e did for skills was introduce tool proficiencies not tied to a particular ability score, thus illustrating the precedent that the two need not be married.
I'd have no problem calling for an Intelligence (Medicine) check, a Strength (Intimidation) check, or a Constitution (Stealth) check. Or any of a thousand other combinations.
As far as I'm concerned, I'll ask for a check, and then let the player provide any justification they like for adding proficiency... whether that justification comes from skills, background, wherever.