DevonDiver
N/A
I thought that at least with regard to PADI, the only time maximum depths are explicitly stated are during training dives.
The are mandatory max depths stated within the standards for training courses. Those are for the purposes of the instructors running the courses.
However, the OW, AOW and Deep Diver courses also have recommended max depths for the divers. These are clearly spelt out within the course materials. They are also repeatedly mentioned within the OW course, including the knowledge reviews and exam.
In addition, PADI are quite definitive about 40m being the absolute max depth for recreational scuba diving.