Draw the line at jobs where someone wields authority over the public, disputes can’t be easily resolved after the fact, and the person doing the job moves around too much for fixed cameras to be adequate. I can’t off the top of my head think of an example that isn’t in law enforcement.
If you take away the authority part, you could say that, for example, cleaning personnel should wear body cameras because it’s so easy for them to commit theft, but they’re already treated pretty poorly and I wouldn’t want them humiliated further.