Many of the other SE sites seem to avoid/discourage certain topics for liability reasons. Examples that come to mind: Photography.SE follows the IANAL approach when folks ask for guidance with contract law and copyright issues; HomeImprovement.SE routinely says "this is very dangerous, you should contact a professional electrician, mould removal specialist, asbestos abatement company, etc."
I just noticed a question about vaccinations that seems like it's heading square into the realm of medical advice that I think we probably need to leave to the actual licensed MDs.
(I voted close/subjective and argumentative on it for a different reason, that topic has virtually become a religious war lately, there's no way we're going to "answer" it here. And just having it around is going to taint the opinion of a lot of potential users, no matter what "the community" says.)