It's just my impression. I know in some people it is like with me, but the poster cases I would consider those like I Jenny who had a great pitch increase in the first weeks. Some heal faster than others in respect to the hoarseness issue as well. I am a bit slow in the pitch gain, but I definitely did gain some. I guess I am average when it comes to the weakness and hoarseness issue. It just takes a long time. Dr Kim said one year, some noticed improvements after 2 years still.
And yes, I had some voice issues before, I first had to do a year of therapy before Dr Kim was confident it would be ok, but I guess the underlying issues are still there, originating in speaking in a changed voice for 17 years without professional help.
The other thing is, I had a massive massive cough attack after surgery. So that is less than optimal...