Vomit draft can be great tool, but there's additional risk in science to keep in mind...
I've heard of a person who advocated this kind of draft, and then did a vomit draft themselves for a research project, with the draft including discussing stand-in results of an experiment that they planned to do.
Their colleague on the project saw the draft, and called out that the experiment had not been done. The writer said that they'd only written the draft to see what the paper might look like, once the experiment was done.
But the person who wrote the vomit draft had a problem doing the experiment...
Then that person submitted the paper anyway, with the vomit draft stand-in experiment results, and the paper got accepted. And without telling the other people on the project.
I understand that the story got a lot worse from there.
The vomit draft wasn't the only problem, but if you see someone vomiting drafts that are effectively scientific fabrication as they stand, I advise being uncomfortable with that, and emphasizing to the writer that this is a more dangerous practice than it might seem.
I think, the problem here stems from making vomit draft a social technique instead of keeping it at a personal level. It is potentially harmful if other people can read it. OP describes it as a personal method and it may work by breaking some psychological issues, like a fear of under-perform or something like. But to do this one need to overcome all fears, to get rid of anxiety, and it needs a safe environment where you can write anything. Literally anything, to try it and to show to your mind that it is harmless thing, nothing bad happens, it is ok to write not good enough, because you can dump it later.
I think the problem here is that they submitted a fabrication. If someone is prepared to do that, I don't think how they drafted the document is really the issue.
I've heard of a person who advocated this kind of draft, and then did a vomit draft themselves for a research project, with the draft including discussing stand-in results of an experiment that they planned to do.
Their colleague on the project saw the draft, and called out that the experiment had not been done. The writer said that they'd only written the draft to see what the paper might look like, once the experiment was done.
But the person who wrote the vomit draft had a problem doing the experiment...
Then that person submitted the paper anyway, with the vomit draft stand-in experiment results, and the paper got accepted. And without telling the other people on the project.
I understand that the story got a lot worse from there.
The vomit draft wasn't the only problem, but if you see someone vomiting drafts that are effectively scientific fabrication as they stand, I advise being uncomfortable with that, and emphasizing to the writer that this is a more dangerous practice than it might seem.