the whole point of giving a speech is to interact with the audience and read the audience body language---by using the teleprompter he might as well just mail the transcript---because we can read too
The speeches have no improvisation and when question and answer time comes---he either bolts or calls on the majority of intellectual pussies that pretty much agree with him and as a result he's an empty suit that can't really defend the stuff he's putting out there his army of bureaucrats put together.
Basically speeches are where the public is supposed to see the real person---and the teleprompter makes it all fake or faker.