Call it lack or sparring or even too much compliance with the persons defense and I would hazard a guess as a Judoka that this is what they are talking about.
I hesitate to comment too much on aikido as I have never done it but I have read a lot about it and the books I read give it too many "supernatural" powers for my taste.
In my books Ueshiba could disapear and re-appear in another room.
He could pin multiple guys on the floor and hold them.
These kinds of things irritate me.
If I could appear and re-appear I'd be making a great living robbing banks, not teaching martial arts.

F.