99 out of 100 articles tagged within moments of creation would have been speedy delete candidates an hour later. It is that 100th article and its creator that not tagging hastily addresses most importantly. It also has a drama-reducing secondary effect even for some of the 99 because some, who would not have said anything when their non-notable subject is deleted when it can be assessed, will squawk if it's deleted before that assessment could have been made. In either case, we don't know what people will write until they write it. We do get valid COI vanity articles. Yes, they are rare, but the point is that there's no benefit in tagging empty articles moments after creation and many reasons not to do so which has been discussed many times at WT:CSD, memorialized in footnotes at the criteria, and is highlighted in a few ways at the top of newpages.