A apartment complex is safely accessible and even if you trespass you are unlikely to place yourself in harm’s way.
An industrial site may have heavy machinery, hazardous chemicals, and have federal ramifications for trespassing. It may be innately unsafe for yourself and put others at risk.
I shared a screenshot earlier where “industrial site” is called out as a rejection criteria.
The topic of the last several comments in this chain have been about the complex itself and my reply strictly to your first sentence saying the same logic applies.
The people who have permission to be on the property, employees, aren’t going to be going about exploring their worksite. It still needs to meet one of the three eligibility criteria, and saying that a worksite in an industrial area is a great place to explore is a very unconvincing argument . I know it’s a matter of opinion, but it does seem as though people stretch these concepts to the extreme in order to fit their POI into a game.