Mat! Great point you make, I initially thought to argue the experience angle, though after a moment of thinking I reckon this a fully encompassing base point, or rather a pillar of due diligence in engineering a successful startup.
I’d say you covered it with the mention of Google and Facebook working the solution. The question is due diligence applied practically and effectively, looking at the examples of others who have made the mistakes so you don’t have to.
Simply put, be smart, observe what’s going on, look at how they did it at the core level, get used to thinking in that language, listen to the founders, hear their message, again… listen — no really, listen — then execute and you may very well have a successful startup that makes a serious difference.