If you had perfect future knowledge (which is what this article is really about) you wouldn't want to invent Slack (or Google), which lets face it would have been a ton of work with a very uncertain outcome. You'd want to invest in Slack / Google at some early stage, do no work whatsoever, and enjoy the proceeds.
Pretty much. I always find it funny when people say: "I'd invent Google" when they could barely pass their first year Calculus class. As if stating the idea is all it took but not the engineering and well ... the actual difficult work. But everyone can invest. That much is totally doable.
I think alot of people aren't passing calculus and doing hard work, not because they're dumb but there's no clear pay off, it's hard to stay motivated