People who are better at talking in person tend to feel this way. Others are better at emailing (I am like this, it gives me time to clarify my thoughts, and delete the petty insults), and think the opposite.
The only time I prefer to see face-to-face is when I need to build a relationship of trust with the person, and it's easier for some people (like you) to see that I am not ripping them off.
Whenever I write a report I always put the summary first because that is all that anyone who trusts me needs to read. The rest is supporting information and extended arguments in favour of the proposition that I make in the summary together with some notes about why alternatives are no good.
Of course, I never went to business school, I'm an engineer who started as a physicist.
I say this as somebody who used to prefer written communication. But I have come to realize that it is necessary to ask your audience, "Does that make sense?" after every major and minor point, and then listen to them reformulate what you just told them to make sure they actually got it.