This is intentional. It is not that I couldn't present a script for direct use - first say this, then that, and finally the other - but rather that I don't believe that is a best practice.
Teachers should be treated with respect - respect for their motivation, for their knowledge, for their abilities. Requiring the use of a script presumes that without one the teacher would be unable to work effectively. I just don't think that is the case.
I do not believe lessons should be, as is sometimes recommended, 'teacher-proof', as if anything other than word-for-word lessons leads to inferior learning.
What I do think is that teachers need support in getting better at what they do; they need opportunities to work together to improve their practice; they need the time and space to reflect on their experiences and challenges; they need to be treated as the professionals they are.
You may want to read the article in Education Week at this link: Stress, Control and the Deprofessionalizing of Teaching for more thoughts on this topic.