What aspect of public speaking did Spencer seem to struggle with?

Spencer's struggle with public speaking can be attributed to his difficulty in enjoying large public gatherings. This aspect is crucial because the enjoyment of the environment can significantly influence a speaker's performance. If someone does not find pleasure in addressing large audiences, it can lead to anxiety and a lack of enthusiasm in their delivery, making it hard to connect with the audience. Enjoyment can contribute to a more relaxed demeanor and a more engaging presentation style, which is vital for effective public speaking.

In contrast, confidence in presenting controversial ideas, engaging with the audience effectively, and articulating complex theories clearly, while important aspects of public speaking, do not specifically address the inherent enjoyment of the setting itself. Without a genuine appreciation for the audience and the speaking event, other skills may be rendered less effective. Ultimately, a speaker's overall comfort and enjoyment in a public speaking scenario are foundational for a successful presentation.