Personal opinions may vary. I think it is very very much worth the effort.Nobody will touch Quads anymore as it's not worth the effort.
I wasn't talking about sound difference, neither were you if I recall correctly. You mentioned arcing due to loosened stator PCB's.No way 0.2 mm on anything will make any kind of objective difference in the sound.
It isn't if it was caused by arcing. Burned.an occasional visible membrane puncture is nothing to worry about
If you cold puncture it with a paper clip the total diaphragm will rip. Completely different subject.