Do we need another certificate managment system?

Do we need another certificate managment system? That is a good question. So when I am looking at OpenCA or Microsoft Certificate Lifecycle Manager it seems there is a lot of functionality included. But with less workflow functionality on one side and high costs and less compatibility to "other" operating systems on the other hand. And there are more sophisticated management systems on the market, some times also with sophisticated pricing. And most of all every system is bonded to one CA system, so if you are working in an enterprise environment you have probably more then one certificate management system. What is the conclusion: Do we need a meta certificate management system?