I've found that manuscripting is beneficial even if you don't stick to the script, because it forces you to think about how you want to say something. It's a form of preparation  even if you end up improv

SimpleStacker

AskSN

What kind of speaker are you?

cryotosensei

I have a habit of preparing a manuscript too, but I usually lack the stamina to finish writing it haha

One reason could be that in the heat of the moment, I find that I seldom refer to my script. Like, I can’t multitask - looking down n looking at the audience is effortful. I think my mind races too fast, so I have to keep a tight rein of my words lest I start to ramble rubbish haha 