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It's not about ghostly possession, or at least not full man-puppetry.
What you're saying is a tulpa is an independant being, spookyhese beings are willed into existance by the mind of a physical, mortal being. It's just like the hoast opening a door for the guest only on a mental level. whenever tulpas were once imaginary friends, spirits or what not, I won't go there.
If the tulpa attacks the person who willed them into being, they may genuinely bleed as if being attacked by a fellow person. This is like off the Matrix where Neo's question on why it hurts when it's just a virtual reality- "the mind makes it real."
I'm not talking about standard imaginary friends children may have, because even if children claim they are "real", subconsciously they know better. But if those imaginary friends have some severe mental effect on the person which leads to physical, thats what I am worried about. (Though little chances are could be haunting since they may know little on tulpas.)
In short I don't like the idea of sharing my sanity with another being, or end up paranoid being worried hours on end whenever I am alone or not.