I pause a lot because I have to go look up words. Sometimes, I also write by hand and then type it up. Would that look unnatural?
What about when you open a new doc to work something out, and then copy and paste it in.
This whole thing seems poorly thought out.
I know people are very excited about the Emboss tool in Ellipsus that can show readers how often the writer paused and if those pauses seem like "natural" human pauses or .... something artificial, something that hints at perhaps AI being involved.