That may have been true in the beginning - but Facebook has grown to much more than that. I guarantee that Steemit will grow, scale and adapt to compete with these platforms on a more even playing field.
In my opinion, yes Steemit is different to Facebook, but it signifies a shift in the content that we put out. The influx of users signifies that how we connect is changing - people want to share deeper opinions with everyone, including friends and family. They also want to connect with close friends, and will be something that Steemit will look at in the future I'm sure. Thanks for your comment!