The bank line is a somewhat stiff to be sure. Yeah, if you tie a square knot it's not going anywhere. Paracord is easier to untie (of course that makes it aggravating when using it as shoelaces). To me the ideal is paracord as a ridgelines and bank line for guy lines and Prussiks.
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman