Personally, I think many agents and advisors like scripts for all the wrong reasons. They consider them like a book of spells in a Harry Potter movie. Read the right spell aloud. The person does what you want. In reality, it's like the Miranda Warning from crime dramas: "If you cannot afford a lawyer, one will be appointed for you…" What are the pros and cons?
Pros of Scripting
Here's the case why you do it.
1. Shakespeare.
When it's performed on stage, the actors don't "wing it." It's a classic, the best delivery. That's the test of time.
2. Someone wrote the script.
It might be a successful agent saying: "Here's what worked for me." It might be a marketing department saying: "We researched what's important to prospects about this product, here's how you say it." Thought went into it. You don't need to reinvent the wheel.
3. What happens when you lose your place?
The prospect goes off on a tangent. You get them back on track. "Now, where was I…"
4. Legal considerations.
You include the stuff prospects need to understand about the product. You don't guess or accidentally make misstatements because you don't understand all the features.
5. Practice makes perfect.
Keep doing something. You get better at it.
6. You aren't winging it.