One of the reasons I like to stick with just couple cards is knowing at any time I can add the total up in my head and pay off everyone I owe completely. As in owe zero nada zip. Unfortunately that is the way you have to operate in today's world including with a plum card or other biz card.
I know a major bank that shut down a credit line of a friend who ran a very legitimate business that was highly leveraged. He went from private jets, a fleet of luxury vehicles to having no car and no home. It was like dominos watching everything fall down. I think it all could have been avoided if the bank game him time to find a new credit line. I am sure he likely broke a loan covenant but it was really sad.