Earlier quoted context omitted.
What is the long-term potential supposed to be? Is Mastodon supposed to replace Twitter, or is it supposed to enhance the lives of people? I'm a member of several small forums that just don't grow. It's the same people each day, and that's fine. It's much closer to how human interactions work in real life. You don't join an ever-expanding pool of people where you strive to maximize your connections (or at least, I do…
Not being indexed by search engines is a fatal flaw in my opinion. There might be some interesting discussions taking place on Mastodon, but I would have no way of knowing.
As an analogy, there might be some interesting discussions happening at my local Community Center, or my neighbor's house, but I would have no way of knowing. But to discover these discussions, I would need to meet someone with a shared interest who would, in turn, share with me a place that they go to for continued discussions and to hang out with interesting people who share an interest.
So maybe, if done correctly, this is a feature? The good content is one extra network connection away, but easy enough to find if an advocate chooses to highlight content, share a connection, or otherwise create an inbound reference to the community.