To the contrary, I explicitly do not write the way I talk; they are very different mediums! Each is better suited to communicate different things / emotions.
Writing gives me the freedom to edit, iterate and polish; something speech cannot do.
I love both writing and speech/presenting - do not be reductionist and reduce writing to mere "written conversation".
It's not that you must say something orally, use a computer automatic transcript and publish that, with all the errors and fillers.
You should edit it heavily to fix errors and increase clarity, but the style should be like something you would say oraly. An uninformed reader must feel that it's just the transcript of an informal talk.
Writing gives me the freedom to edit, iterate and polish; something speech cannot do.
I love both writing and speech/presenting - do not be reductionist and reduce writing to mere "written conversation".