Operation capability is one thing, but then there is the backup question. When, what kind, and how much.
Sure they all worked fine when on separate storage, but then it got pooled and many of those databases trying to do full backups at various times over the weekend now saturate this pooled storage I/O, so they take longer. Which causes backup windows to run into other windows. And then you have a total FUBAR situation.
Be careful out there...