I don't, although I do not really know anything more than you do: I have seen the same concerns that you allude to, and my bias is to not leave it running all the time. I do let it run every so often for 24 hours just to keep the lubricants moving. On the other hand, I remember seeing some owners post that they do leave it running, and I suppose that if Embassy say that it is OK...then I suppose that likely it is.
Marc.