I think this will be the unpopular opinion, but writing, text, is actually the problem.

Most emails/tweets/texts read like statements of proclamation.

The cues of a "hmmmm" or the rise in pitch in voice, can indicate someone isn't sure of the position. Or that they're pitching it as a possibility, not the actual solution.

All of those cues are lost. Twitter is the worst offender - I've seen many of people that I follow present in person at conferences and they come off as humble and approachable.

But their tweets are written as a bold, definitive statements, and read as a proclamation to be argued and challenged.