There are theological disputes about just what this verse is talking about, but whatever else it may mean, it is also a pretty fair depiction of the acceptance of salvation. When you hear and understand His gracious voice and choose that yes you really do want Him there (thus opening the door), He rushes right on in and no created thing can kick Him back out. Asking is superfluous.
I tend to agree, but I wouldn't say surperfluous; I'd say a natural expression of the above. Communion and communication go with each other; they're not at odds with each other.