That is the part where I would agree with you at the most. Sure, There are no perfection to any schools out there, much less the Deaf Schools either. Every schools have their own flaws but you're right, The deaf schools needs to have their educational system to be improved.
This is in no way to blame the Deaf Schools for what they have done. With a lot of emphasis to bring the awareness could also overturn things but then, the problem is, a lot of administrations are obliged to do otherwise. That is why or the reason at the most for many teachers at the deaf schools whom are having a hard time to sought out for better answers to teach the deaf children.