I think that publishing platforms (like Steam, for example) fail to deliver a unified set of tools for the developers. Frankly, when I develop game, I don't want to bother with configuring a website, forum, blog, etc. If these tools are already provided in the same place, you just have to concentrate on what you love, developing the game.
This is the set of tools that I would want to be readily available in one place: game web page, forum, features/bugs(with tags), blog(with tags for different subjects), wiki, polls. I know it seems like a lot, but if they use a CMS, this can be configured one time and be readily available for all users.
If itch.io manages to implement this before others, I think it's popularity could skyrocket.
Plus, I think that game development should be a more open (to the public) activity. Hell, even Hollywood movies have started to show behind the scenes videos of their upcoming movies. And if you don't want the story spoiled, simply don't watch them.