What makes you think we don’t?
I would like to consider your approach carefully. What you are describing is a situation in which two beings have perfect and instant communication between them. Okay. I can buy that. The question though is does that mean that there are no longer two, but one? I don’t think so. If point A is connected to point B by perfect communication conduit C you don’t get point ABC. There are still three points, not one. As long as no unity in being is held I just cannot see how one gets from plural to singular. Not in the sense conveyed by a change from the form
Gods to the form
God.
I can concede that one can speak of unity. There can be many levels of unity here. Unity of mind, purpose, intent, will, or so on. However, unity does not negate plurality, unless the unity is one of being. If you have two beings, you cannot then have one being simply because they have perfect communication. Neither can, as you suggest, two individuals become one individual. There can be unity. That I agree. But to say God, rather than Gods, just requires more.