I always took this as "you're not a domain expert so you'll get it wrong", with the implied corollary that if you actually _are_ a domain expert, then you know

I always took this as "you're not a domain expert so you'll get it wrong", with the implied corollary that if you actually _are_ a domain expert, then you know what you're doing. IOW, hire bonafide domain experts rather than trying to cheap out.