Very interesting. Maybe the ones I've seen that were torn was due to work done in the area, exposure, and time. Come to think of the gaffer's tape, now that I think of it, that does not have the staying power that would last years like some of the examples we have seen.
Update - I went back and looked through 100 pictures and have to eat crow - can't find any evidence of the tape used to hold the wire in place during installation. Not sure where I picked that up, and stand corrected.