in my case I am half deaf and half blind from birth. They diagnosed me with cerebral palsy but it wasn’t awful and with physical therapy I got past it.
I want to regular school. But I stuttered. (Biden has it worse but I recognize the difference between a stutter and other reasons). Learning to pause for a split second before speaking to mentally organize the tumble of thoughts that wanted to come out all at once helped a lot.
Because my own underlying systems are flawed I consider those possibilities with communication.
I don’t think a strictly Markovian model would work as you would need some kind of kernel of memory to have time to work out what was said (deafness) and what to say (otherwise one would stutter)