Literary techniques are ineffectve when it comes to speeches?

This is simply not true. Literary techniques can be very effective in speeches, as they can help to engage the audience, create a memorable message, and persuade the listener. For example, the use of metaphor, simile, and analogy can help to illustrate complex concepts and make them more relatable to the audience. Pathos, logos, and ethos are all important elements of persuasion and can be enhanced by the use of literary techniques.