If I could have just one feature added to Medium, it would be: Show 100% of my articles to 100% of my subscribers.

Facebook sucks because it shows posts to 2-4% of your followers. All the other platforms are similar.

If Medium shows 100% of a writer's articles to 100% of her subscribers, that writer will adore Medium... and so will the reader, who is getting exactly what they asked for. This singular feature would make Medium the greatest reader-writer platform in the world.