I wrote this explainer piece 8 months ago, which was well received.
Like anything, there are a few things I'd put slightly differently now, but I think it stands up reasonably well.
I had an excellent response yesterday actually; using desert nomads as an analogy.
Living on sand has limited what we can build, we've always just had tents; but some guys have dug down and found bedrock, so now we have a foundation to build huge, permanent structures online.
So far, they're only small, from a distance they don't look much different to the tents; but the potential is there to build amazing new structures we've never imagined before.
That's my blockchain go-to. If they follow that okay, I branch off into Steem specifically.