In my opinion listening to yourself can actually help. You might realize that you are either speaking too fast or too slowly. You might notice that you are usi

In my opinion listening to yourself can actually help. You might realize that you are either speaking too fast or too slowly. You might notice that you are using your squeaky voice, there are ways to improve it. You might realize that you assume some piece of tech is known to everyone even though it's pretty obscure. You might realize you need one more slide for transitioning to a new topic better. I agree though with your other point, the recording can help enforce that there are no redos before a live audience. Also, if you mess up a sentence or slide all the time, maybe your phrasing is too backwards, so you should probably simplify it to something that feels natural to you.