I am really disappointing how much water was left in the rug
.
(especially the "hole glide")
The reason for this is because it is restricting the wand nozzle similar to being half clogged with a glob of lint & debris. Therefore, yes, your conclusions were correct in my experience.
However, the real purpose of a Glide is to help make the wand nozzle move easier (which it does) and/or, not allow it to "lock down" in certain situations thus causing interruption of airflow .
This is nothing new.
Best to all;
Ed Valentine
cross-American.com