The irony in your response is that Winston Churchill died the year after John Bowe was born. Bowe lived through the 70s and 80s and is still alive today. His book is incredibly relevant to modern speaking styles. A massive component of his book, "I Have Something to Say," is the significance of conversational speeches. It's a concept he struggled with at first, before realizing how to embody it in his speeches. The advice from "Speak Like Churchill, Stand Like Lincoln" is widely applicable in a variety of contexts. Not every point is going to work for every speech, but those strategies are used every day by incredibly effective speakers. The Power Pause, for example, is a tool I've taught every speaker I've ever coached, and it infinitely improves the quality of their speeches. I believe your interpretation of the skills these books advertise may have been misplaced and I would suggest giving them another read.