From personal experience, I'll explain what likely happens.
Particularly in a large venue like the DC, the mic brother is instructed to get the microphone as close as possible to the mouth of the brother. However, this becomes uncomfortable for the speaker because the mic may now be in the way when looking down at his notes. I suspect that Splane was doing the amateur's mistake where he walks out to the podium and either stares out at the audience or stares at the mic adjuster as he's doing his job of adjusting the mic.
Personally, as a speaker, I knew that when he was adjusting the mic, I should look down at my notes and keep my chin up at a comfortable angle. This would give the dude his best chance at knowing the best placement for me, neither too high nor too low. I did both circuit and district talks as well as dozens of congregations, and that rule of thumb served me perfectly. However, if I was assigned to adjust the mics for any large program or even for some visits by the CO, I would do anything to get reassigned to a different job because pricks like Splane would go totally batsh!t primadonna on the mic placement.
Accounts like this remind me how inexperienced and egotistical GB2.0 really are. If any of them had any real experience adjusting mics and running an audio console, they would have their acts together and not make fools of themselves like this in front of a large crowd.