In order to better understand how D/deaf and Hard of Hearing people and people with Auditory Processing Disorder/Deficit operate, it's essential to take an in-depth look at what sound is and how exactly hearing works with the human brain. We hear with our brain, not our ears. Hearing is not always consistent.
It's unfair to hold D/HH/APD people to an unrealistic standard with the presumption that people can only be profoundly deaf or completely hearing, with no middle ground. The reality is, hearing in and of itself is vastly complex. There's so much we don't understand about how the brain works. Let's continue to educate ourselves on these matters.