I believe it is not required because any public speaking is made up of 3 elements, namely
1. Ethos (credibility or the speaker)
2. Logos (logic behind any conclusions drawn by a speaker)
3. Pathos (emotional appeal or ability to create connection between the speaker and his audience)
First, to be asked to share their thoughts, observations, and ideas publically a speaker should possess a certain level of authority and knowledge about the chosen topic (ethos).
To make sure that the message is received and understood correctly by the audience, it must be conveyed in a clear, informative, and logical manner (logos).
And to capture and hold the audience’s attention the speaker must first establish an emotional connection with the listeners (pathos).
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath