If there is an unintentional conncetion in the schematics, the ERC may not even catch the problem. For the program it is hard to decide if the link is intended or a mistake. So it would not be about having to picky an ERC but possibly an ERC that could give even more warnings. There could still be a warning (e.g. like both ends of 2 pin part connected), but I don't know.
When doing the layout one would normally notice such a fault at least. So some manual error check is still a good idea.