Investors like to categorise ideas into macro tech trends and hypotheses. There's a good reason for this but it also means you can miss the biggest ideas (the space-defining ideas).

I imagine a lot of investors looked at Airbnb and thought, "cute". Then someone coined the phrase, "sharing economy", in the wake of its growing success and a lot of other "cute" ideas raised money.

From my experience, what investors often lack is an understanding of the vision. I remember someone describing Airbnb to me back in 2010. I said it would never catch on for XY&Z obvious reasons, including it sounded like a bad experience. That's because I wasn't pitched the vision correctly. I bet the Airbnb guys took a long time to figure out the right way to pitch it.

Investors like to be objective/data-driven and therefore don't spend too long building an emotional relationship with the product. Again, there's a reason for that, but sometimes founders have products that don't look like anything that exists elsewhere, so it's super important to convey how it really works.