I can't see what procedures could change. Supervise your child getting in the boat. Make sure they stay seated until unload. Supervise your child getting off.
I still lift my 7 year old into the boat and out, and we take our time getting the other younger ones in/out. We do not let go off hands until seated in the boat or clear of the platform edge.
I'm not passing judgement on the parents but DLP is known for their visitors not following rules. We were there last week, on potc and iasw the load cm was asking for kids to be seated in the middle of the row where possible. We're British, we follow instructions. Other nationalities do not.
I would be very surprised if this turns out to be the fault of Disney.