“(hero that must simultaneously explain WordPress.com vs WordPress.org and sell the product)”
Spending hero real estate disambiguating yourself from your own open-source project means the first thing a visitor processes is confusion, not value. The .com vs .org question is a support article, not a headline.
“Lead with the outcome, not the taxonomy: "The world's most flexible website platform — fully managed, no server required. Start building in 5 minutes."”
Visitors who searched for WordPress.com already chose the hosted version. Restating the distinction wastes the highest-attention real estate on a question they already answered, instead of selling the product.