I dont think they are simple, as they are capable of high thought (i.e. spoken language skills, and able to learn from humans), dispite having their only defined organ (as opposed to collections of tissue) being thier eyes.
A creature like that would HAVE to be quite complicated.
I think this way more better than having baby that came from her mamumamu or stalk.The babies too cute so I want to bully them.Anyway,why do the food can have a baby?The world is going to end....
Binary division hasn't been seen in yukkuri for almost an age. And, now that it has appeared again, doesn't seem to have shifted types - it's still a Reimu and still appears to be, if there is such a thing, "Reimu's Reimu."
Ah well, it made more sense when they were just simple animate sacks of innards and didn't have all of this ridiculous meta-biology attached to them.