But before starting your sentence, you internally formulate the gist of the sentence you're going to say.
Which is exactly what happens in LLMs latent space too before they start outputting the first token.
It's statements like these that make me wonder if I am the same species as everyone else. Quite often, I've picked adjectives and idioms first, and then fill in around them to form sentences. Often because there is some pun or wordplay, or just something that has a nice ring to it, and I want to lead my words in that direction. If you're only choosing them one at a time and sequentially, have you ever considered that you might just be a dimwit?
It's not like you don't see this happening all around you in others. Sure you can't read minds, but have you never once watched someone copyedit something they've written, where they move phrases and sentences around, where they switch out words for synonyms, and so on? There are at least dozens of fictional scenes in popular media, you must have seen one. You have to have noticed hints at some point in your life that this occurs. Please. Just tell me that you spoke hastily to score internet argument points, and that you don't believe this thing you've said.
What happens in the black box of the human mind to determine the next word to write/say is exactly made irrelevant in this level of abstraction, as regardless how, it would still result in a linear sequence of actions as observed by the environment.