::Indeed the orphaned blocks exist, but only much the same way your deleted files exist on your hard drive for some time.  For all intents and purposes, once they have been effectively abandoned by the network, they aren't really there anymore in any useful sense.  Having the blocks shown there leads people to wonder, "OK, are my transactions on the main chain or on orphaned blocks?  What's the difference?".  The current image suggests no competition, it still leads people to believe it's a block tree, and "orphaned block" (having no obvious definition outside the context of Bitcoin) might tend to be understood as "leaf node", especially since the line of black blocks seems to yield to the orphan blocks instead of running straight.  If I had the skills to make such images I'd volunteer, though I have gotten a lot accomplished by pointing things out and seeding ideas in the past, and seeing who picks up on them.