Yup you are totally correct, I don't think any camera company uses such strong loctite, but some other people who aren't repairmen might unknowingly use it. I use blue loctite for many applications myself if I know that lens has screws that get loose easily through use or vibration, I actually don't even use the liquid, there is a new type of loctite thread tape that I cut a sliver off and wrap, less messy. I've repaired a few lenses where I had to chip off nail polish too. Sometimes only way is to drill on a botched up repair.