Sharp metal edges can very easily cut plastic covered wiring. Many people do not realize wires and houses vibrate and or move around all the time. Wiring in contact with sharp wiring like this exists far too often. Wiring touching sharp metal like this can easily start a fire without notice. Often metal wire screening like this is grounded or bonded making the sharp metal more of a hazard.
A person inadvertently pulling on wiring anywhere in the home can easily be cut by the sharp metal without realizing it.
What are the odds wiring like this was installed by a licensed electrical contractor. Wiring is supposed to be installed with permits, inspections and approvals. While not every person installing wiring has a license to do so those who do are much more likely to do the job correctly.
Owners who occupy one family homes can install their own wiring however there are limitations. Wiring is supposed to be installed with permits, inspections and approvals even if the home owner is allowed to install the wiring.