You are correct, there are possibilities to have miscommunication issues. This is a risk that is being taken when escrowing your own deals. However this possibility of this happening is the same as if there is a direct trade between two parties.
You seem to have the missed the point---or you have it bass-ackwards.
If you're escrowing your own deal you're offering hidden risk to the other party. You've done yourself a favor, not a disadvantage. As Ecua correctly says, the point of a third party is to negotiate any issues from a
neutral point of view. He correctly emphasizes that misunderstandings can arise even if everyone is operating in good faith. If you escrow your own deal and your trading partner doesn't know you're doing this, then when you sort out a misunderstanding in your own favor, you've pulled the wool over your trading partner's eyes and gotten paid to do it.