A PowerPoint plan (“deck”) is less important than an elevator pitch, and an elevator pitch is less important than an introduction. Read What should I send investors? Part 1: Elevator Pitch for tips on crafting an elevator pitch. Many investors will just skim a deck and take a meeting if the introduction and elevator pitch are good.
But you can still send a deck. A deck lets investors learn more about your company. It demonstrates that you’ve thought about the company in detail. It’s an industry norm. And you need one for presentations anyway.