A very nice overview but I'd add one more thing: how is Steem different from other platforms?
Up till now, the internet has known two ways to encourage and reward content creators:

• you get exposed to advertising
• or you pay a subscription / tip the author

Steem offers a third way that has never existed: vote to distribute the value generated by a blockchain.

I'm sure you will be able to express it better but IMO it's crucial to emphasize this new economic model that Steem brings to the internet. People follow revolutionary ideas, not just a set of features. Steem is not just a decentralized Reddit, it's much more than that.