One thing to note is that converting to outlines will essentially change the text to an 'image'. So it's like looking at a jpeg of text - it won't be able to be highlighted, copied etc. (I'm sure there was a better way to word that, but the terminology escapes me)

Given how it's a slide deck, this probably isn't a big deal for distribution. But if it's important to you, I'm sure you can OCR the final product, and that wouldn't end up embedding the fonts. Unfortunately that's sort of a roundabout process.