Single owner isn't really the problem per se. Rather it's the owner(s) being significantly involved in the operations of the company, such that they can still b

Single owner isn't really the problem per se. Rather it's the owner(s) being significantly involved in the operations of the company, such that they can still be held to be personally responsible for the actions in question or the LLC can be declared undercapitalized (since it's not just paying someone to do those jobs). So like much of the legal system such structures don't actually provide much protection for individuals, but rather well-moneyed conspiracies.