ujjwalusri
Most often one of the biggest failures of a manuscript speech or scripted speech is the lackof intonation that comes from reading. The very nature of it tends to make people seem robotic. The other is that it may not sound natural as it may not reflect the way in which someone would normally communicate. Consider someone reading a script written by a physicist to a group of children.... Not very effective.
Answers & Comments
2.they were hard to mobilize