True, but they are easily reinforced...Hog rings or J clips and welded wire. Anyone that can use a scissors or pliers can install that...The big advantage is the complete ease and time saving of the installation.
J clips won't work trying to put welded wire to chain link, none of the wires are ever perpendicular to each other. Only hog rings will fasten welded wire fence to chain link fence... well unless you put the welded wire on at an angle but that would be a nightmare to do but might look cool if you had different colored welded wire fencing.
JT