I think people will be attracted to places like blue sky because they are more similar to what they are used to and more user friendly. When people were looking to leave Twitter, I remember Mastodon being talked about. When I first looked into it, it was super confusing. I'm literally a software developer, and I was having trouble figuring out what was even going on here.
I understand that different platforms will have different features, and don't expect lemmy to be exactly like reddit or mastodon to be exactly like Twitter. But to get casual users to come to either, they need to be easy to join, easy to use, and easy to understand. I think that starting off by explaining to users what the fediverse is is too confusing.
Frankly, I think the biggest thing right now, by far, is that there needs to be a centralized, or pseudo-centralized, login system. That is the biggest hurdle for all new users, and explaining how to make an account basically requires explaining how the fediverse works-which for most people is just too much information at once. They'll see that, think "this is too confusing," and leave.
Ease of use and adding more features will come with time, more users, and an influx of money from those users to support development. But we need to attract users first, and to do so we need to make the process of joining really clear, concise, and easy. And we need to remove the risk that if your instance gets deleted, so does your account.