Planning word is a normal part of speaking but for us PWS we tend to focus on fluencies when/before we are talking but natural fluency can't be labored. If we are trying all means to make speeches fluent that is not something we should do with our different neurologies and that's my point. And yeah you got it right most of us can speak fluently when we are reading alone etc. but the problem is when we are speaking to others, and I believe the reason is that our neurology is of low efficacy when we are speaking, our brains can't undertake it well like normal speakers do, leading to our stuttering. So to sum up we gotta speak(or communicate) in different ways from normal speaker's.