These bethel entrance videos have been around for a long time. A lot of it is just how to live in an institutionalised setting. Some in the past have dealt with proper oral and body hygiene because not all new bethelietes have the same standards of living as each other. They also go into proper decorum when at the table or during spiritual activities such as not asking the family doctor what that weird rash is at the breakfast table and waiting to make an appointment. It can also be a sensitive subject to bring up with a roommate if they are openly masturbating in the room with you there, so I am sure they found this way a lot more sensitive.
Not every little thing needs to be blown out of proportions.