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That's why I said "as a starting point."

The five paragraph form itself is a beginner's tool: any good essay will deviate.

However, one nugget to borrow from the five paragraph form is the centrality of the thesis statement. Having a thesis for your talk is _crucial_ IMO. It doesn't have to explicitly stated, and it could be as simple as "I'm going to convince you that $FEATURE is awesome," but you need a focal point. You could restate what I'm saying here as honing your elevator pitch for you talk or in any number of different phrasings, but the idea is the same: a short statement that sums up the absolute core idea of your talk and provides a focus for you and your audience. Anything that doesn't fit your thesis is a good candidate for trimming.