Thanks for the input, it certainly seems to be the prevailing thought.  I don't know why I was convinced otherwise.  
And that issue of not co-mingling funds, etc., is something I've always had to mention to these particular clients, because they, and family, have multiple operations ongoing, simultaneously, and the different accounts and records are practically incestuous, there's so much cross-over.  But now that they've created an LLC for one of the entities, and have been advised by their attorney to create a 2nd LLC for the real estate, I was sharing with them, advice I've seen, suggesting that the co-mingling of funds can be used as evidence that you and your LLC are not, in fact, separate entities, thereby shattering the liability shield, rendering your LLC useless.